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Choi Hee-Young (Song Ha-Yoon) had her son Go-Ya (Kim Gun) at the age of 19. She is now in her mid 20's, runs a pizza restaurant with her mother (Sung Byoung-Sook) and takes care of Go-Ya as a single mom. She has lied to her son and told him that his father is in America. Choi Hee-Young takes a break from her daily life and attends a high school reunion. She wonders if her first love Go Soo-Chul (Moon Ji-Yoon) will be there. Meanwhile, former class president and now accomplished English teacher Oh Dong-Joo (Gu Won) tries to catch Choi Hee-Young's attention.