Seung-ryong owns a small toast shop, who is sick from taking in briquette gas in the past after his parents died. One day, his first love comes back to Korea, and they become close. However, he finds out that his little sister is sick.

After six failed relationships Eun Jin is determined to succeed with her clumsy unromantic boyfriend, but questions arise when she suspects that he is hiding something.

Choi arrives at a new high school to work as a student-teacher. During her first day at work, the teacher that she is assigned to work with, Lim, hits on her in a very brash way.

The border of 820 is where the North and South Koreas stand face to face. Elite female lieutenant Kwon Jin-kyeong from the Korean Military Academy and 4 other cavalry battalions are on patrol on their last day of training. Meanwhile, students from the photography club get lost on their way to check out scenery and enter BAse 820. An unknown shot is fired and the group is terrified. Kwon Jin-kyeong and her team look for the source of the shot...

Sun-Il (Yoo Son-Il) lost his friend because of an accident. So he left to travel. One year later, he appears in front of friends again, but Sun-Il resembles his dead friend a lot. His friends keep watching him. Their friendship is in critical condition unlike the past. One day, he falls in love. Sun-Il has the happiest and sweetest moment in his life with Ji-Soo (Park Grina), but because of an unexpected incident Sun-Il feels strange with himself.