Butterfly Sleep (2017)

Has a similar fleeting quality to it.

Challenges of a mature woman, Family Pressure, Steamy Kiss, Workplace, Nice Male Lead, Forbidden Love, Older Woman/Younger Man, Male Chases Female First, Disapproving Parent

On a spring day Munakata Ikujou visited an old temple to view a 1000 years old sakura tree. There Ikujou discovered a 3-year-old girl and adopted her as his own daughter. 16 years later, Sakurako has grown up to become a beautiful woman. Sakurako then has a fateful meeting with Takanashi Hiroto. Their pure love begin.

•Korean ML-Japanese FL
•Older Woman- Younger Man
•Exchange student
•Age difference

Both of them are romance dramas but they're different in terms of mood genres. This one is more heavy in sense of subjects as it includes tags as Illness as Alzheimer's disease.

Romantic love story between ML younger Korean man & FL older Japanese woman. Kim Jae Wook soooo adorable! A must watch intercountry romance movie. Simple yet adorable.