[13D CUSIP No. 45173K101 Joint Filing Agreement This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument. [Remainder of this page has been left intentionally blank.] ANFERNEE SONG GUAN DT01 HOLDINGS INTERNATIONAL LIMITED Anfernee Song Guan Director EX-99.1 2 d120771dex991.htm EX-99.1] [13D CUSIP No. 45173K101 Page 2 of 11 Pages 1 Names of reporting persons Anfernee Song Guan 2 Check the appropriate box if a member of a group ¨ x (a) 3 SEC use only 4]

[13D CUSIP No. 45173K101 Joint Filing Agreement This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument. [Remainder of this page has been left intentionally blank.] 13D CUSIP No. 45173K101 LC FUND V, L.P. Jiaqing Li Authorized Signatory LC PARALLEL FUND V, L.P. Jiaqing Li Authorized Signatory LC] [13D CUSIP No. 45173K101 Page 2 of 12 Pages 1 Names of reporting persons LC Fund V, L.P. 2 Check the appropriate box if a member of a group ¨ x (a) 3]