Regression Instinct

"I'm going to regress you to three years before we met." The moment his guiding partner, B-class guide Shim Cha-yeon, is in great danger, Jin Kang-woo sacrifices his life to forcibly regress him to three years before they met. "Welcome, customer." "Huh...?" "Excuse me, customer? Are you feeling unwell?" Shim Cha-yeon, who could never forget Jin Kang-woo, finds Kang-woo after much effort after regressing, but of course, he doesn't remember Cha-yeon. He succeeds in building a relationship again step by step, but unable to overcome the guilt of the incident being twisted or the past being brought forward because of him, he decides to say goodbye to him once again... "Don't go. You promised ...