Stakeouts after school: A day in the life of Korea's Gen Z private detective

By day, Oh Ji-wan is a history major at Ajou University.

By night, he tracks suspected cheaters, fraudsters and missing persons as a private investigator.

While many college students spend their evenings studying, socializing or pursuing romance, this one is more likely to be on the road or staking out restaurants or motels, hunting for leads.

"There was one time when a family asked me to find their son, who was about my age and had run away from home and cut off all contact," Oh, 24, said in an ...