Sis, I Can Be Both a Wolf and a Sweetheart

Gentle, beautiful medical doctor older sister VS younger brother in his start-up phase, who can be both wolfish and sweet

Three-year age gap

At first, it's partly a teacher-student relationship, with the older sister filling in for an elective class for a month

Theme: No matter how late first love arrives, it still feels like a wilderness on a midsummer night