Luna's persistence and evil deeds were revealed. She poisoned Shi Yin, cut the brakes of Ya Zhen's vehicle, killed Bong Zhou, and attacked Jin Pil.Shiyin discovered that Luna was responsible for all this and found drugs in her office.At this time, Shang Dao came in and asked Shang Dao about Luna's address. Shang Dao mentioned that Tae Hao had asked the same question before, and they realized that Tae Hao was in danger.Se-yin informed Dong-sik of the situation and quickly rushed to Tae-ho's help.After breaking in, Tae-ho was found unconscious on the floor.Tae-ho is quickly rushed to the hospital and news of Luna's behavior spreads.Everyone is shocked to find out that Luna is the murderer.Meanwhile, Tae-ho's condition is improving after treatment.

Luna's sister is being questioned as her sister and her fiancé are the main suspects in the case.After questioning, she talked to Shiyin about Luna.She tells Shiyin that they are adopted sisters, something Luna has done more than once in the past.Luna cared for their adoptive mother when she fell ill, but her sister discovered that Luna had entered incorrect data into her mother's diary.However, her trust in Luna outweighed her suspicion and she never investigated further.Now she realizes that Luna might do something similar to Shi Yin and tells Shi Yin to be careful.

Shiyin recalls her memories of Luna and comes up with a plan to lure Luna into showing up.She tells Dong-sik about the plan and announces a concert to attract Luna.She will perform a piece of music with Luna, and this piece is the starting point of Luna's obsession with Shiyin. She tells everyone that she will play this piece of music with Luna alone, but everyone does not agree with her facing danger alone., Shiyin reluctantly accepted their company.Dong-shik is surprised by the details in Luna's diary and follows Se-yin's plan.

Yazhen decided to attend the concert, Shiyin told Yazhen not to put herself in danger, Yazhen told her that this was also her last concert with the Han River Philharmonic Orchestra, and she would leave the country after that.The two women eventually reconciled, expressed their wishes and said goodbye to each other.On the other hand, Tae-ho finally wakes up and asks about Luna, when Jung-jae gets a call and learns about Se-yin’s plan.He hurried to her and asked her not to carry out the plan, but she would not listen to him.She tells him that she knows he will always let her do what she wants, leaving Jung Jae speechless.

Shiyin announces that she will play violin with Luna at the concert, and the news is broadcast.After Kim Young-jin was arrested, he revealed the fact that Luna threatened him to provide drugs.Oh Hyun Suk will serve as conductor.The concert finally arrived and the orchestra played its first piece, live.Luna holds a ticket to watch the show.After the group's performance, Dong-sik told Se-yin that Luna hadn't arrived yet.But when the duo's performance started, Luna had not yet appeared, and Shiyin performed alone. Midway through, Luna came on stage and performed with Shiyin, bringing unparalleled harmony.After the performance, Luna expressed her emotions in Shiyin's dressing room.The police and Jung Jae arrive and Shi Yin tells Luna that she will pay for her crimes.Luna had expected it, but she wasn't afraid of getting caught because she was ready to make sure Shiyin would always remember her.Luna took out the knife and walked towards Shiyin, and Zhengzai rushed to Shiyin's side.However, Luna stabbed herself in the neck.

The scene changes to some time later, when Shiyin is ready to fulfill her dream and travel.She happily bids farewell to her father and friends, meets Kim Pil, who has lost his memory, and heads to the Han River Philharmonic before trying to see Luna in prison.Unfortunately, Luna refused to meet her because she wanted to be remembered for how she was during her final performance with Shiyin.After that, Shiyin went to her mother's grave and opened the envelope, which contained the test results of her disease.A smile appears on her face and she leaves to find where Jung Jae is waiting for her.When Se-yin silently agreed to him accompanying her on the trip, Jung-jae held her hand tightly and stayed by her side.