Finding a bl manhwa

Hi! I'm trying to find this manhwa I forgot the title because I let it marinate for too long. It's something like bl omegaverse.
Mc and ml grew up in an orphanage together. Mc use to be bigger and ml was cuter and more feminine so a lot of people thought he was an omega.
The orphanage director tried to sell off the ml because he thought omegas would make more money (or something)
So mc stole money from the orphanage and told ml to wait for him so they can escape together. But he got beaten up and didn't make it to ml in time.
Many years passed and ml changed his identity and wanted to take revenge on the mc because he thought he had been abandoned by him many years ago.
So ml is now performing experiments on him to turn him into an omega.
Also there was a weird ntr part where this friend(?) of ml started liking the mc or something
Any help is appreciated!