Mr. Seo apologizes to Kim for not being able to meet him in person. He tells Kim that he will meet him later in class. Kim apologizes that he can't meet him today because he's in a "strangely complicated situation" where they're "fighting" over a guy. Kim says that he knows a lot more about the situation than he does, and that he'll have to act like he doesn't know what's going on. He's not going to run away from seeing a guy's back, he says, just like he did with Mr. Yeoh. He says that if they go back to the "point where you forgot about each other" , the back of Yeoh will become the "back" of someone else, and he won't be able to keep going.