Observing My Mother’s Friend’s Son

For the first time in her life, Im Sei ends up visiting her mother’s friend’s house, who just happens to be the Executive Director of a major department store. She was offered a tutoring job for the woman's youngest son. So, she heads up to the second floor to meet her new student…
There, she accidentally walks in on the eldest son, Tae Seungjoo, completely naked. Branded a pervert and kept under “surveillance” for an entire year, she finally completes the tutoring job. Then, her mother’s friend presents her with an offer she can’t refuse.
Sei, please keep an eye on my son Seungjoo.”
“I’m sorry, ma’am… but I think your son might be… a bit of a crazy bastard.”