In the novel, they did twice on the bed, then on the shower, and after shower. And then at the end of this chapter, it was implied that they would be doing it again but they were out of cond*ms. Sangwoo volunteered to buy some, but Jaeyoung said that Sangwoo won't be able to go to his part-time because he won't be able to walk by tomorrow . Sangwo said, "Please go as my substitute again, I'll pay for the part time job." End of chapter.