I don't think the problem with this series was that there was a big age difference. Because we've watched couples with an age difference before(I Hear Your Voice, Secret Love Affair, Romance is the Bonus Book. Light in Your Eyes, One Spring Night...). I think there was no chemistry between the main couple. Even though I enjoyed watching their old times, Da Jung's old version bothered me. It was like she couldn't get into the acting role. Especially 13-14. What was the acting of the woman in the episodes, for God's sake? She acted like she was 15 years old and in addition the scenes were irritating. For example, there is a kissing scene at the end of episode 14. Pay attention to the acting of the female character in that scene. She is crying but her face looks like she is disgusted. I think I should point out that the script is also weak at many points. Especially in the episodes in 2020. I felt the emotion more intensely in the parts describing the old times. I wish old Dae Young would act in romantic scenes. There were times when I questioned the meaning of Yoon Sang Hyun's presence in the drama. I think it was a pity for him. In order to express the emotion more in very unnecessary scenes, those scenes were played by the old Dae Young. But there was always LDH in the romantic scenes. LDH acted great, but we can't deny that the script is weak.