Minji and Yuna were always together. From the age of 17 to now, until the age of 21, they have been each other's best friends. From that day on, the relationship subtly changes. It started with Minji's strange dream in which Yuna appeared! Their relationship begins to turn into something other than best friends.

Unrequited love, excitement, and obsession. "Bad thoughts" that grow one after another in each others mind.

Where will our "bad thoughts", which started on a lush college campus, end up?