After being involved in a car accident, Si-hyun is left with no memories of the accident or her past. The accident causes her to see sounds in color which is often disorientating, forcing Si-hyun to protect her ears. She encounters Ji-won in the hospital and moves in with her when she is later discharged. Upon hearing Si-hyun humming a strange melody in her sleep, Ji-won’s brother, Woo-hyuk, writes it down as a score and gives it to her, hoping that it would help her remember something of her former life. Meanwhile, Jee-il, a failed songwriter stumbles upon this score and offers to find the melody. They embark on a healing journey as they collaborate to complete Si-hyun’s melody.

Drama series depicts the story of marriage, remarriage and divorce. Han Mi Mo was once an idol group member, but she now works as a representative of a remarriage consulting business. She gives honest answers to her customers who hope to remarry. Song Soo Hyuk is a divorced man in his thirties with an 11-year-old son. He is a good-looking gossip reporter who looks like he is still in his twenties. He is very good at his job, because his looks and smiles melt the hearts of his interview subjects, and they are very willing to disclose even the deepest secrets. “One More Happy Ending” will deal with the stories of the divorced, who dream of becoming happy one more time.