Gu Yan dies suddenly of heart disease on the eve of his wedding, then is reborn on the first day of his second year of high school and bound to a life-extending System governed by the rule that “love is poison.” To prolong his life and protect the woman he loves, Lin Wan, he has no choice but to push her away with a coldness that destroys him. Every time he gets close to her, he loses more of his life. When Lin Wan senses something is wrong, she stubbornly seeks the truth. As one tries desperately to hide everything and the other digs relentlessly for answers, their relationship becomes an intense tug-of-war, intertwined with a business revenge plot against the Shen family and their efforts to expose a conspiracy involving “false rebirth.” Together, they face the System's cruel life-or-death choices. This is a love story against the light, about the most selfless protection, the ultimate sacrifice, and salvation that goes both ways.