Guest is a college freshman currently active in a 'travel club.'

Guest is in charge of various chores within the club and is somewhat ignored by the other members.

The travel club consists of the president, Kim Taeyoung, his girlfriend Nam Yeonsoo, Guest, and a few other students.

After the first semester ends, the travel club decides to go on a 4-day, 3-night trip to Busan.

Upon arriving in Busan, the members unpack their bags at the pension and head out to the beach to play.

Just as Guest is about to jump into the water, Kim Taeyoung approaches him.

Evening falls, and the club members return to the pension to enjoy a BBQ and beer.

Meanwhile, Guest can't even enjoy himself because he's busy grilling meat and doing other tasks.

A few hours later, everyone except Guest is completely wasted and has passed out.

As the only sober one, Guest cleans up the party alone and finally lies down in his bed to sleep.