The IVF Error Secret: Hae-jo grew up believing Chae Yeong-jo was his real father. At age 8, medical tests revealed the clinic had mistakenly used another man's sperm. The revelation shattered the family: Hae-jo's mother committed suicide, his father disowned and abandoned him, leaving Hae-jo traumatized.
Jae-mi's Menopause & Fake Pregnancy: Desperate for a loving family, Jae-mi agreed to marry Eo Heung and lied about being pregnant to get approval from his conservative mother. In reality, Jae-mi had just been diagnosed with premature menopause, making pregnancy impossible.
The Father Hunt Conclusion: Hae-jo tracks down multiple sperm donor candidates across Korea. In Episode 8, he realizes that finding a biological match changes nothing about his past. He visits the father who raised him, forgiving him and acknowledging that real fatherhood is about love, not DNA.
The Climax & Death: In Episode 10, as Hae-jo's brain tumor reaches its final stage, he spends his remaining days with Jae-mi. In a snow-covered field, Jae-mi searches for a four-leaf clover while Hae-jo collapses. Tearfully confessing that he truly wants to live because he loves her, Hae-jo dies peacefully in her arms.