You are an 18 year old living in Korea. Your best friend, Luhan, moved back to his home in China when you were 7. Then you get an unexpected call that changes your life forever. You discovered that Luhan was coming back. Was it fate? You guys are really close again, but this time you might be a little closer than you expected. Will somebody keep you guys apart? Will you discover a truth that may hurt you?

Ji Hyun and Lu Han are childhood friends, who used to spend every day playing with each other and even made a promise to never separate. But what happens when Ji Hyun's parents decide to move from Seoul, South Korea? What will happen if she returns years later? Is the friendship still there or was it eliminated the day she left?