Stop Heartbreak, She's the OneFolge 2

Richie and Lila were childhood sweethearts, but when they were kids, Lila was injured in a kidnapping case and lost in order to save Richie. When Richie grows up, he is forced to marry Sophia in order to find the missing Lila, but due to various misunderstandings, he fails to recognize Sophia as his childhood friend Lila. Sophia is bullied in Alex's home, including being set up by Daphne and misunderstood by Alex. As the series progresses, Alex discovers the truth, but it's too late, and Sophia commits suicide in despair; in his grief, Alex avenges Sophia's death by destroying Daphne's family, and ultimately misses Sophia in his loneliness.