It is only after Heidi Jaffe's death after donating her heart to Chad Shelby's first crush does Chad realize he had already fallen for her a long time ago. Overwhelmed with guilt, he chooses to end his own life—only to unexpectedly transmigrate into the system and enter Heidi’s world. Determined to make amends and win her back, he tries everything to regain her love, yet uncovers a cruel truth regarding what he thought was Heidi's unconditional love for him.