"I'm an adult now. I'm going to sleep with 122 men!" In his highschool years, Taeho made a ridiculous promise with his childhood friend, Shin Sari; to give each other their first times! Taeho buries this promise in his memories as he matures and eventually forgets it. However, Sari is still fixated on this promise when they reunite in college!

Robot meets shamanism. Suho, the protagonist, has the spiritual ability to see demons with his eyes. Suho's mother was a shaman who was famous all over the country. However, she disappears after leaving behind a mysterious remark to Suho a few years ago. Growing up without a mother, Suho enters college and attends the military. He joins a traditional culture research club, but meets a mysterious woman there. Mago disappears without a sound rumor to Suho, who had an exorcism activity with Mago at the first meeting. After a few days, Mago appears in front of Suho again... .