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"Mr & Mrs Shen" who are harmonious on the surface, however each have their own little secret. Married first and then "conflict", falling in love and killing each other.

To get a boy from her past to leave her alone, Kim Yeon Do uploads a photo of a random guy claiming him to be her boyfriend. However, she does not realize the photo she chose was of bad boy student Ji Hyun Ho. When she ends up spending more time with him to make it up, she realizes that people have a lot more to them than what she sees.

Adapted from a mobile dating simulation game "Best Mistake" (일진에게 찍혔을 때) by Day7 (데이세븐).

Wayne Lai is determined to make his own name in the business world and triumph over his father (Elliot Ngok), as a way of getting back for the many years of having to live under his tight control. Despite previous failures, Wayne is ready for another comeback with the help of Raymond Wong, Nancy Wu and Edwin Siu. They start up a mobile application company, with the intention of waging an all-out business war against Elliot. Ever since Wayne left home, his brother (Raymond Cho) has been cast aside by Elliot. His stepmother (Susanna Kwan) uses this opportunity to promote her son (Jason Chan) as the successor of the corporation and secretly works out a takeover plan. Facing repeated attacks from Susanna, Wayne fortunately receives the emotional support of his ex-girlfriend Maggie Siu and her autistic son (Fred Cheng). He also reconsiders his relationship with his father. Seeing Susanna's plot to take over Elliot's business empire, Wayne joins with his brother Raymond and step-uncle Power Chan to fight back. Unexpectedly, friends turn into rivals, while former foes become allies, making it difficult to distinguish the enemy in this dangerous dilemma.

Yiu Hok Sum is detective who is skilled in reading human body language, especially of people who try to deceive him. With his knowledge of criminal psychology, he is able to solve cases by paying close attention to the behavior and reactions of witnesses, with the help of his team. However, his relationship with his stepfather's side of the family is strained since his mother is looked down upon as a gold-digger, who married shortly after her Yiu Hok Sum, as a young child, witnessed the death of his father.

The second season is set in even more turbulent times than the first; during the reign of Emperor Gojong, a period where every aspect of Joseon, from financial, military, and economic to the culture was spurred towards modernization. The chaos and confusion resulting from these rapid changes form the background for the crimes that occur, forcing the Byul Soon Geom to be reformed in order to investigate them. The team is led by Jin Moo Young and Han Da Kyung, two people with deep scars and burdens from their past.

The special task force is adrift after their epic loss to Darker, the mastermind behind series of high profile vigilante killings. With their captain on the run for murder and them no closer to catching Darker, the team switches gear and investigates a decades-old hostage case. In those dusty old files, they discover Darker's real identity and a possible police cover up, but establishing the wrongdoer and the aggrieved party proven more difficult than it seemed. The team must determine the true culprit before Darker does, lest he kills his way through the suspect list.