After a car accident leaves one man dead and another in a coma, it's believed that the dead man was at fault. Guilt-ridden, his wife, Hee-ju, struggles to move forward. She ends up learning that the victim had previously tried to kill himself. Suspecting the accident may have been on purpose, she begins an investigation.
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.