The Three Musketeers
The Three Musketeers (TV) Episode 6
S1 E6:
Seung-po teases Sohyun that he is jealous of Dal-hyang. This prompts Sohyun to challenge Dal-hyang to another duel. Meanwhile, someone changes the lock of the library Yong Gol-dae is in, and Dal-hyang chases after the spy that caused such chaos.