Its been 4 months since Lay paid Hyunsoo  to be his best friend's girlfriend. Lay paid her because he said, Luhan didn't had a girlfriend for 2 years already. And Lay wanted to see Luhan's happiness by did it. Lay made a contract that Hyunsoo didn't allowed to fall in love with Luhan. But what will happen if Hyunsoo fall in love with Luhan? What if Luhan find out about everything?