Jia and Guest are a happy couple attending the same university. Jia loves Guest dearly, and Guest loves Jia just as much. However, there is one problem: the fact that Guest has narcolepsy.

Narcolepsy is a condition where one often falls asleep involuntarily even while performing daily activities. Because Guest becomes completely defenseless when asleep, many people with ulterior motives often try to approach. This makes Jia feel anxious.

However, there is nothing that can be done about it, as Guest cannot control the sudden onset of drowsiness.