Usia pada saat memerankan Love Letter:
Cast and characters
Main characters
1. Jo Hyun-jae as Lee Woo-jin (Andrew) ➡ 23
Lee Woo-jin was raised by a cruel aunt before being taken to live with his priest uncle. Although he believes his mother has died, it is later revealed that she abandoned him to become Jung Woo-jin's stepmother. Kind and introspective, he wrestles with his desire to become a priest with his feelings for Eun-ha. He studied medicine in university and is a trained surgeon.
2. Soo Ae as Cho Eun-ha ➡ 24
Another orphan taken into care at the seminary after the death of her mother. Although antagonistic at first to everyone, she slowly develops feelings for Lee Woo-jin. She is caught between affections from Jung Woo-jin and her own unrequited love for Lee Woo-jin. A life threatening heart condition makes her ask Lee Woo-jin to choose priesthood over her. Although the surgery on her heart was a success she slips into a coma. She awakens from a coma at the end of the series ready to spend the rest of her life with Lee Woo-jin.
3. Ji Jin-hee as Jung Woo-jin ➡ 32
Although initially friendly to Lee Woo-jin, his jealously of the relationship of Eun-ha and Lee Woo-jin as well as the discovery that his stepmother is Woo-jin's biological mother causes him to act out of character and sabotage Lee Woo-jin's attempt at happiness. Like Lee Woo-jin he is also a qualified surgeon. He has unresolved issues with his father for leaving his biological mother and although he rebels against him, he finds himself turning out to be exactly like him.
Supporting characters
4. Son Hyun-joo as Father Peter ➡ 38
Father Peter is Lee Woo-jin's maternal uncle who raised him in the church after rescuing him from a cruel paternal aunt.
5. Kim Young-ae as Dr. Im Kyung-eun ➡ 52
Im Kyung-eun is Lee Woo-jin's biological mother who abandoned him at birth.
6. Kim Yoon-kyung as Seo-young
Eun-ha's friend.
7. Kwon Min-joong as Sister Esther
8. Yoon Yoo-sun as Sister Gemma ➡ 34
9. Yang Hee-kyung as Maria ➡ 49
Father Peter's cook/housekeeper.
10. Joo Hyun as Dr. Jung Myung-woo ➡ 60
Im Kyung-eun's husband and Jung Woo-jin's father.
11. Choi Jae-hyung
12. Seo Hyun-ki
13. Son Young-joon
Jung Woo-jin's friend
14. Jung Mi-ae as Andrew's high school classmate
15. Yoo Seung-ho as young Lee Woo-jin/Andrew ➡ 10
16. Han Ye-rin as Hee-jin
Lee Woo-jin's cousin.