apts gangnam severance hospital employees, coworkers, and patients, other medical professionals including a rival, yonsei university alum/former classmates, childhood friends and people to drag him out to be social, cousins and in laws, any other lines we can come up with, k-drama faces (bae suzy, yoon bora, kang sora, park haejin, nam joohyuk, kim goeun, seo kangjoon, etc)