As a high school senior, Su-Jeong began playing an online game where she met another player nicknamed "Black Dragon". They unexpectedly got close, developing crushes and planning a meeting in real life… that concluded in humiliation and disaster when "Black Dragon" turned out to be an awkward middle schooler instead of the young man he portrayed himself to be! Sixteen years later, Su-Jeong is a skilled planner at Yongseong Department Store, but her job is about to get a shakeup with the arrival of Ban Ju-Yeon, the ambitious new head of strategic planning and heir to the company. There's just one problem: Ban Ju-Yeon is actually "Black Dragon", and Su-Jeong still holds a grudge. Will their past come back to haunt them, or can they find a way to resolve their misunderstandings – and even find love as adults?
19-year-old Sujeong had a busy life filling the gap of her late mother. She met her first love 'Black Dragon.' However, her romantic ended up becoming the most embarrassing moment in her life.
Sujeong tries to make up for her relationship with Juyeon, but to Juyeon who has a secret life, Sujeong is just an eyesore. The tables are turned when Juyeon's secret life is busted by Sujeong.
With Juyeon in the lead, Yongsung Department Store is having a large-scale renewal project. Juyeon and Sujeong become closer as they work together. Then Juyeon becomes highly disappointed in Sujeong.
Sujeong receives help from Juyeon unexpectedly. She can't stop laughing at the new side of Juyeon. Meanwhile, Shinwon ends up doing something for the first time in his life for Hajin.
Hajin sees Sujeong and Juyeon together. She must set them apart before they recognize each other. Hajin even draws Shinwon to set them apart!
Why on earth did he kiss me? Sujeong is confused about what happened last night. She expects Juyeon to ask her out or explain why he did it, but Juyeon keeps quiet.
Juyeon doesn't hide his feelings for Sujeong. However, Sujeong rejects him due to the 'younger man' trauma. Then Juyeon is about to get caught by Hyoseon.
Sujeong and Juyeon finally confirm each other's hearts. Their risky secret relationship begins. They must hide it from everyone, yet they're still happy to be together... But what is this ominous feeling?
'Strawberry' and 'Black Dragon' met again. Due to the broken heart in the past, the conflict between Sujeong and Juyeon deepens. To make things worse, their scandal breaks out.
Juyeon gets fired. He's abandoned by Hyoseon in the end and left alone. Sujeong hides the crisis from Juyeon and struggles to make an effort. Meanwhile, Hajin's ex visits Sulo.
Joo-yeon negotiates with Hyo-sun. Soo-jeong and Joo-yeon, who returned to the strategic planning headquarters, work hard to make the renewal project a success. However, all their efforts are met with difficulties that will go down the drain, and Joo-yeon decides to do something.
Soo-jeong, who lived alone, shouldering everything in order to be recognized and not be ignored. Joo-yeon, who wanted to be loved by her grandmother even while hiding herself. Can the two of them release their respective seals and be together?
Complete episode guide for My Dearest Nemesis with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in Portugal.
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