Koo Gum 2

Klin, also known by his Japanese name Yoichi, is the only son of Angsumalin and Kobori, a Japanese officer who died during World War II. Angsumalin raises Klin with great strength and resilience. Although Wanas, a former Free Thai movement member who has long loved her, confesses his feelings and offers to care for them, Angsumalin remains faithful to her memory of Kobori, maintaining only a close friendship with Wanas. She tries to instill Kobori’s spirit in Klin, but as he grows up, Klin feels a deep-seated resentment toward his Japanese heritage.
By the time Klin becomes a lecturer at the Faculty of Economics, Thammasat University, Thailand is under a military dictatorship. As a modern-thinking young man, Klin becomes a leader in student protests against Japanese goods—ironically, without anyone knowing his background. Only Chitapha, a fellow lecturer, knows his secret and constantly warns him of the dangers of his political involvement.
Among the protestors is Sarawanee, a prominent third-year Political Science student. Klin is deeply impressed by her. However, Sarawanee soon discovers that Klin is actually her older cousin—the "half-Japanese" son of Angsumalin, whom her family despises for marrying an enemy soldier. Following her family's prejudice, Sarawanee subjects Klin to what would today be called social bullying, revealing his ancestry to the public. This causes his peers to alienate and distrust him. Only Chitapha, who is Sarawanee’s aunt, stands by him.
The tension shifts when Sarawanee is arrested. Klin rushes to save her, leading her to finally meet Angsumalin. Upon meeting her, Sarawanee realizes that Angsumalin’s love for Kobori was genuine and that she isn't the "traitor" her family claimed. Sarawanee changes her attitude and apologizes, and the two cousins begin to form a deep bond. This reconciliation enrages Sarawanee’s aunt, Kob, leading Sarawanee to run away from home.
Tragedy strikes during the "Day of Great Sorrow" (the October 14 uprising). Klin searches for Sarawanee amidst the chaos and finds her critically injured and traumatized, haunted by the guilt of leading her friends to their deaths. As the government resigns following the mass casualties, Chitapha decides to move abroad to seek medical treatment for the dying Sarawanee.
In this moment of parting, Klin realizes he loves Chitapha with all his heart. However, they cannot be together as she is already engaged to a foreigner. They part with a promise to remain each other's strength from afar. Back at home, Angsumalin’s health declines, and she frequently asks when Chitapha will return. In her final moments, she asks Klin to play the Shamisen for her. As Klin plays, he doesn't realize that his mother has passed away—Kobori has finally come to lead Angsumalin to the Milky Way, fulfilling the promise they made years ago. Klin is left playing the music alone.