Gaeul: You've been staring depressingly at that book, are the problems that hard?

Leeseo: Yeah, how does this even work

Gaeul: Oh c'mon you just have to do this

Leeseo: Are you sure with that formula?

Gaeul: Of course, when have my calculations ever been wrong?

Leeseo: Well..

Gaeul: Shut up, that was only one time