Kim Jae Won / Park Ji Bin
Coming from a background where he lacks nothing, his bright, healthy, and remembers everything in detail as long as his interested in it. He is a talented genius, and started liking Hae Ju from middle school, in which he attended with Chang Hee. He came back to Korea after 15 years, and reunited with Haeju. Haeju started to enter his heart again. Haeju slowly makes his heart race and along with her sweet smile, Kang San slowly opened his heart to her.