Spoiler!
So the old owner captures him with a woman when Couque is working in a part time shift and then when they meet the old owner kidnapped him so the old owner tries to buy couque from Gun Min and he declines so we figure out he's a black belt and he fights off like 5 dudes and then old owner tries to stab him but misses a little bit and it falls out of his hand then he finds out where Couque is and saves him and Couque thinks that gun min is old owner bc h was closing his eyes and then gun min signs the contract then yeah it ends
