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Lee Tong (Felix Wong) grew up with only one intent in mind: revenge. After his gangster father died in the hands of friends Fang and Fong, Tong was raised by his father's henchman, trained to be a lone assassin. Coming of age, he finally sets his plan into action and kills an underworld boss. Timid driver Au-yeung Gong (Michael Miu) unwittingly witnesses the crime but is too scared to rat out Lee, leading to an unexpected friendship. Gong ends up helping Tong enter the organization, laying the path for Tong's revenge. As time passes, Tong's cold and lonely front begins to fade as he experiences life, love, and friendship for the time, but Gong is slowly transformed from a naive youth to a cold-blooded killer.

35-year-old architect Seung-Min receives a visit at his office from a woman. Seung-Min doesn't recognize the woman at first, but then realizes the woman is Seo-Yeon. Seo-Yeon is his first love, but he hasn't seen her since his freshman year in college. Seo-Yeon now has a request. She wants to hire Seung-Min to rebuild her home on Jeju Island. 15 years ago, Seung-Min is a naive young man beginning his architecture studies in college. He first meets Seo-Yeon in his Architecture 101 class. As they work on a class project together, Seung-Min and Seo-Yeon begin to fall in love. Back to the present day, Seung-Min is hesitant to take Seo-Yeon's job offer. Seo-Yeon persists and even goes to his boss with her wish. Seung-Min now has no choice, but to take on Seo-Yeon's home project. Old memories of love and heartbreak will soon resurface, as they find themselves at different junctions in their lives.

A humanistic melodrama that follows the tragic love and success story of a man and woman who get tangled up in tragic destinies due to conflicts in their parents’ generation. The drama depicts how one generation's problems can negatively affect the next generation.