For years, she always has to wait. Kim Hanbin always asks her to wait. Without any clear explanation of what thing she actually has to wait from him, but she always does. Three years passed and they reunite, but sadly they reunite to the fact that Hanbin asks her to wait again. What's her decision this time? Will she wait for him again?

Jung Krystal is an undergraduate student of Environmental Engineering in Massachuchets International Technology (MIT) and now is going to Seoul National University in South Korea for two years student exchange program. Of all the countries, she chose South Korea in purpose: because A. It’s his dad’s hometown, so B. Most of her relatives are there. She only has her eyes  to only study and has no idea that South Korea will change her life, a lot