Male lead fully aware that female lead and second male lead are in love with each other

He loves the female lead, but see that she and the second male lead are in love with each other. The male lead somehow gets her to date him, but then lets her go so she can be with the other guy. The thing is though she's fallen for the male lead now and chooses him.

Girls’ generation 1979

 gaurij:

Jealousy incarnate

 Gulsan:

Girls’ generation 1979

 brownieoholic:

I feel like this is also thumping spike 2

Thanks. If you can think of anymore, please post them.