The following table summarizes changes in the carrying amount of the convertible redeemable preferred shares for the years ended December 31, 2019, 2020 and 2021:

	Series A Convertible redeemable preferred shares (par value US$0.001)						Series B Convertible redeemable preferred shares (par value US$0.001)						Series C Convertible redeemable preferred shares (par value US$0.001)						Series D Convertible redeemable preferred shares (par value US$0.001)						Series E Convertible redeemable preferred shares (par value US$0.001)						Series F Convertible redeemable preferred shares (par value US$0.001)						Total
	Number of shares			Amount			Number of shares			Amount			Number of shares			Amount			Number of shares			Amount			Number of shares			Amount			Number of shares			Amount			Number of shares			Amount
Balance as of January 1, 2019		9,497,040			238,504			7,586,836			201,588			33,320,256			1,041,923			10,068,160			1,010,041			—			—			—			—			60,472,292			2,492,056
Issuance		—			—			—			—			—			—			—			—			30,021,942			3,693,326			—			—			30,021,942			3,693,326
Collection of Subscription Receivables		—			—			—			—			—			16,697			—			—			—			—			—			—			—			16,697
Accretion		—			123,459			—			94,078			—			335,372			—			(4,189	)		—			329,279			—			—			—			877,999
Balance as of December 31, 2019		9,497,040			361,963			7,586,836			295,666			33,320,256			1,393,992			10,068,160			1,005,852			30,021,942			4,022,605			—			—			90,494,234			7,080,078
Issuance		—			—			—			—			—			—			—			—			4,203,072			495,318			—			—			4,203,072			495,318
Accretion		—			83,312			—			65,967			—			311,443			—			147,741			—			696,035			—			—			—			1,304,498
Balance as of December 31, 2020		9,497,040			445,275			7,586,836			361,633			33,320,256			1,705,435			10,068,160			1,153,593			34,225,014			5,213,958			—			—			94,697,306			8,879,894
Issuance		—			—			—			—		—			—				—			—			1,953,652			241,341			9,777,383			1,179,326			11,731,035			1,420,667
Issuance upon conversion of convertible bonds		—			—			—			—			10,906,031			192,122			—			—			—			—			—			—			10,906,031			192,122
Accretion		—			21,898			—			17,207			—			246,015			—			37,083			—			186,424			—			—			—			508,627
Convert to Class A Ordinary shares		(9,497,040	)		(467,173	)		(7,586,836	)		(378,840	)		(30,284,935	)		(1,467,859	)		(7,952,405	)		(940,464	)		(5,876,520	)		(916,388	)		(9,056,944	)		(1,092,428	)		(70,254,680	)		(5,263,152	)
Convert to Class B Ordinary shares		—			—			—			—			(13,941,352	)		(675,713	)		(2,115,755	)		(250,212	)		(30,302,146	)		(4,725,335	)		(720,439	)		(86,898	)		(47,079,692	)		(5,738,158	)
Balance as of December 31, 2021		—			—			—			—			—			—			—			—			—			—			—			—			—			—
Authorized as of December 31, 2019		9,497,040						7,586,836						33,320,256						10,068,160						30,021,942
Authorized as of December 31, 2020		9,497,040						7,586,836						44,226,287						10,068,160						36,122,625

All series of convertible redeemable preferred shares were converted to Class A/B ordinary shares immediately upon the completion of the Group’s IPO

The following table summarizes the issuance of convertible redeemable preferred shares up to December 31, 2021:

Key terms of the Series A, B, C-1, C-2, C-3, D, E, F convertible redeemable preferred shares are summarized as follows:

Each preferred share shall have the right to receive cumulative dividends, on an as-converted basis, when, as and if declared by the Board.

The order of distribution shall be made from holders of Series F convertible redeemable preferred shares, holders of Series E convertible redeemable preferred shares, holders of Series D convertible redeemable preferred shares, holders of Series C-3 convertible redeemable preferred shares and holders of Series C-1 and C-2 convertible redeemable preferred shares, holders of Series B convertible redeemable preferred shares to holders of Series A convertible redeemable preferred shares. No dividend shall be paid on the ordinary shares at any time unless and until all dividends on the convertible redeemable preferred shares have been paid in full.

In the event the Company declares dividends, for holder of Series A convertible redeemable preferred shares, the non-cumulative is at the rate of 8% of issue price, for holder of Series B, C-1, C-2, C-3, D, E and F convertible redeemable preferred shares, the cumulative dividend is at the rate of 8% of issue price.

Upon the occurrence of any liquidation or deemed liquidation event, whether voluntary or involuntary, all assets and funds of the Company legally available for distribution shall be distributed to the shareholders in the following order and manner:

Holders of convertible redeemable preferred shares of later series have preference to the distribution of assets or funds over holders of convertible redeemable preferred shares of earlier series and holders of ordinary shares, in the following sequence: holders of Series F convertible redeemable preferred shares, holders of Series E convertible redeemable preferred shares, holders of Series D convertible redeemable preferred shares, holders of Series C-3 convertible redeemable preferred shares and holders of Series C-1 and C-2 convertible redeemable preferred shares, holders of Series B convertible redeemable preferred shares to holders of Series A convertible redeemable preferred shares. The amount of preference will be equal to 150% of the issuance price plus any and all declared but unpaid dividends.

After distribution to the holder of convertible redeemable preferred shares the amount of preference, all remaining assets and funds of the Company available for distribution to the shareholders shall be distributed ratably among all the shareholders on a fully diluted basis.

The holders of the convertible redeemable preferred shares have the rights to convert of the preferred shares into ordinary shares at an initial conversion ratio of one for one at the option of the holders at any time. The initial conversion price is the issuance price of preferred shares, subject to adjustment in the event of (1) share split, share consolidation, share dividend or other similar event, and (2) issuance of new securities at a price per share less than the conversion price in effect on the date of or immediately prior to such issuance. In that case, the conversion price shall be reduced concurrently to the subscription price of such issuance. Each preferred share shall automatically be converted, into ordinary shares upon the closing of a Qualified IPO.

Each preferred share confers the right to receive notice of, attend and vote at any general meeting of members on an as-converted basis. The holders of the convertible redeemable preferred shares vote together with the ordinary shareholders, and not as a separate class or series, on all matters put before the shareholders.

At the option of a holder of the convertible redeemable preferred shares, the Company shall redeem at the redemption price all or any part of the outstanding convertible redeemable preferred shares, upon breach of contract, or at any time after the redemption start date for each series of convertible redeemable preferred shares. The redemption start date is December 31, 2022 for all series of convertible redeemable preferred shares.

The redemption price equals to the greater of (1) the issue price with an twenty percent compound per annum for Series A and Series B, or ten percent simple per annum return for Series C-1, C-2 and C-3, Series D, Series E and Series F (if the period is less than one year, such return shall be calculated pro rata) to the redemption price payment date, plus all accrued or declared but unpaid dividends or (2) the fair market value of preferred shares.

The Company classified all preferred shares as mezzanine equity in the consolidated balance sheets because they are redeemable at the holders’ option any time after a certain date and are contingently redeemable upon the occurrence of certain liquidation events outside of the Company’s control. The convertible redeemable preferred shares are recorded initially at fair value, net of issuance costs.

The Company records accretion on the convertible redeemable preferred shares to the redemption value from the issuance dates to the earliest redemption dates. The accretion, calculated as the current redemption value, is recorded against retained earnings, or in the absence of retained earnings, by charging against additional paid-in capital. Once additional paid-in capital has been exhausted, additional charges are recorded by increasing the accumulated deficit. The accretion of convertible redeemable preferred shares was RMB877,999, RMB1,304,498 and RMB508,627 for the years ended December 31, 2019, 2020 and 2021, respectively.

The Company determined that the embedded conversion features and the redemption features do not require bifurcation as they either are clearly and closely related to the convertible redeemable preferred shares or do not meet the definition of a derivative.

The Company has determined that there was no beneficial conversion feature attributable to all convertible redeemable preferred shares because the initial effective conversion prices of these convertible redeemable preferred shares were higher than the fair value of the Company’s ordinary shares determined by the Company taking into account independent valuations.