Battle for Happiness S01 E10 Episode 10

"She died for someone's happiness."

Mi-ho is certain that the anonymous post was written by Yu-jin. She unlocks the USB with a professional’s help and finds Do-jun’s video in the "Pandora’s Box". She confronts Do-jun, but he claims that Yu-jin started to suffer from anxiety after meeting Mi-ho and committed suicide. In front of Yu-jin’s house, Mi-ho finds a package addressed to Yu-jin with a note and a key.