The Last Time I'll Tell You I Love You

Mo is a bright, high-achieving girl with a strong will. She is deeply in love with Qi, who vowed to protect her. But Qi keeps breaking his promises, and Yu is the one who keeps stepping in to do the things that Mo and Qi were supposed to do together. Just as Mo decides to give up on Qi and accept Yu, she discovers a huge secret about Yu and Qi. What should Mo do?