Model Gu Yi develops acute appendicitis after an accident and, by a twist of fate, is admitted to the hospital where his ex-girlfriend, Jiang Tang, works. She personally takes charge of his treatment. The abstract, one-of-a-kind tattoo on his body conceals years of unspoken affection, but an awkward misunderstanding only deepens the distance between them. Regrets from their past breakup, misunderstandings involving others, and the constraints of their families of origin weigh heavily on them. Yet the cool-headed and gentle doctor Jiang Tang has quietly protected Gu Yi for two years since their breakup, shielding him from online harassment and silently supporting him whenever he needs help. As the two people who have secretly loved each other all along unravel their misunderstandings, they gradually let go of their stubbornness and insecurities. Reunited after years apart, they finally overcome the barriers between them and turn their youthful feelings and lingering regrets into a love that lasts a lifetime.