Here's a summary

Red head guy needs to find his mate to become king. He runs into MC and thinks he is his mate. Turns out White haired guy experimented on MC and made him artificially red head's mate. The pink hair guy is his real mate. When red head finds this out, red head's father kidnapped MC to try and sell him at an auction. At the auction MC gets beat to death while trying to escape. The guards get scared and cremate his body. This event and the experimentation done on the MC somehow awaken dormant orc/beastkind genes in him. He is reborn like a phoenix through ashes and is now developing as a beastkind. At the auction red hair dude basically left MC for pink hair dude because his father said he can't be king if he doesn't marry his real mate. At this point I'm guessing the father was in on the trick white hair dude and pink hair dude did. So white hair dude buys MC from auction and has his way with him while holding him prisoner. Red hair guy decides he doesn't care about being king and loves MC. He refuses to mate with pink hair dude. His dad gets mad and puts him on probation with this collar thing that saps his powers. Red hair plots with his subordinates and friends a way to rescue MC from white head. They plan MC's fake death. When MC "dies" White haired guy realised that MC was actually his real mate. He has a break down because he now knows he experimented on his own mate and sent him into the red head's arms. Then he realizes pinky was behind this. Pinky tries to throw MC's body off a cliff. (He thinks he succeeded) Red head saves MC in time. MC is developing as a beastkind and I guess it's painfull and he could die. So red hair finally had sex with him to transfer energy to him and saves his life. Red head sends MC to his friend, Blue hair water dragon dude. They find out MC has become like an ancient beastkind tribe that is prophesied to be the true kings of the beastkind. Now it looks like red head is helping MC without him knowing. Pinky trying to suck red head's father's dick. White hair dude is MIA. So that sums it up.