In "My Heart Is Going to Explode!", after the end of a relationship marked by gaslighting, Soojin is haunted by the girl with the green light she slept with on a drunken night. The girl literally emitted a green light. While her friends scold her for losing her sanity, a UFO appears in the sky over Seoul and begins attacking everyone. Amidst the chaos, Soojin needs to find the girl with the green light.
