Welcome to list where mc transmigrated into BL novel, and the supposedly protagonist uke of novel become seme because of MC's action.

Type 1: Novel MC read was a 'lie' / not accurate / fanfiction version , so there is no relationship between protagonist uke and protagonist seme

Type 2: accurate, but indeed changed because of MC

Type A: The novel MC read is actually his past life, past life lover, mc got memory loss, etc

Type B: MC is totally randomly transmigrated, no hidden past, past life, lover, hidden secret