Aoi and Hazuka are classmates, but they are not friends. The two girls meet an elderly woman who wants to give a love letter to her first love. Hazuka and Aoi try to find her first love.
A note indicates that class has been moved to the science lab. The lab is unoccupied, but Jan Di waits, not realizing that the room is filling with fumes.
After treating Jan Di in a cruel manner, Mr. Jung prepares everything so that Jun-Pyo can visit her in Seoul. Will he be able to go without Madam Kang finding out?
Yi-jung is waiting outside for Eun-jae, excited to see her -- until he listens in on her phone conversation; from her words, it sounds like a call to a boyfriend.