9. He's Coming to Me
10. Are you human too?
next person can pick the topic
10 Dramas/Movies where one of the main leads uses to write a personal diary1. Twenty-five, Twenty-one
2.) Kitchen For Singles
3. Psychopath Diary
4. The Hunter's Diary (movie)
5. 1 litre of tears
6. mouse
7 3 Nin no Shingurumaza - Sutekina Jinsei Gyakuten Monogatari you can even buy the diary 1 MC develops on amazon.co.jp
8. our secret
9. Our Blues
10. Love in the Air
10 where the FL is at least 8 years older than the ML in RL
1. Alchemy of Souls Season 1 - Jung Somin (1989) and Lee Jae Wook (1998)
2. Forecasting Love and Weather - Park Minyoung (1986) and Song Kang (1994)
3. Encounter
4. Tomorrow [Kim Hee Sun (1977) & Lee Soo Hyuk (1988) - 11 Years]
5. My Lovely Sam Soon [Kim Sun Ah (1973) & Hyun Bin (1982) - 9 Years]
6. I Hear Your Voice [Lee Bo Young (1979) & Lee Jong Suk (1989) - 10 Years]
7. 18 Again, but likely not what is meant by the topic. mid-30s estranged husband becomes young again. There's a 17-year difference between the actor playing his teenage self and the actress playing his wife.
8. Lost- Jeon Do Yeon(FL)( 1973)&Ryu Joon Yeol(ML)(1986) [13 yr gap]
9.Secret Love Affair- Kim Hee Ae(FL)(1967)& Yoo Ah In (ML)(1986) [19 yr gap] this one is wild lol