I forgot the title but it's a BL Chinese novel wherein the MC transmigrated into a novel amd he become the villain. However, everything has already happened and he has a system that urged him to fix everything so he become an author writing about the villain's pov (his pov) when he was chasing the protagonist.
OMG! I was also looking for this book! MC got so popular that he was even able to hold book signing events (but with anti-fans too who carried "hate" materials) and even release merch. When MC found out that ML was lying, ML gifted him a room full of flowers, and then MC and ML sold the flowers in the street. Hahahahah Wait, lemme try series finder.
After the Bankruptcy of the Supporting Male Lead I didn't finish reading it yet, but it's super funny.