One would think that being seven times faster, stronger, and smarter than the average human being would make life spectacular. But for Oh Sehun, Earth's resident extraterrestrial, his life has been monotonous.

Moving through the years blending in with the oblivious humans, he simply existed. He was careful not to forge bonds with the fragile, ridiculously short lives around him. While everyone aged and died, and generations came and went, Sehun lived on as a quiet observer from the sidelines.

This was so for 400 long and lonely years.

But it would all be over—the isolation, the homesickness— in a matter of 3 months when the comet finally arrives.

(What Sehun didn’t predict, with all his alien superior senses, was the whirlwind superstar by the name of Lu Han, who sends Sehun’s orderly life spiralling out of control with every encounter.)