In Hong Kong, family members of a missing person may apply for the person concerned to be declared legally dead after seven years. While production house boss Yeung Man-sum decides to forget his wife Koo Ching-tin, who has been missing for seven years, and marry his lovely and supportive girlfriend Chu Sin-mei, his son Chi-hin’s birth mother Ching-tin astonishingly turns up! Due to some falling off a cliff accident, Ching-tin became forgetful and ended up homeless somewhere overseas. With lawyer Kam Cheung-sing’s help, Ching-tin returns to Hong Kong after seven years. She wants to retrieve her old memories. Ching-tin again works as a journalist. She curiously finds out someone seemed to have harmed her when she went missing. Meanwhile, Man-sum is torn between his new love and wedded wife. And he is worried about Ching-tin recovering from amnesia as the situation could get out of hand.
Policewoman Yiu Chi-yue is a natural born Highly Sensitive Person. She brings chocolate, salty lemon water and a brain with an “on-off switch” with her whenever she investigates cases. Her senses are heightened when she drinks salty lemon water that arouses her keen awareness of clues at the crime scene. Through touching the dead body, gathering evidence and her senses, she empathizes with the victim and reconstructs the sequence of events. Since Chi-yue met restaurant boss Wong Mik-kei, the duo are no longer “spectators”. Perpetrators at large are killed one after another. Chi-yue covertly challenges some serial killer on several occasions, and their true identity is gradually uncovered. Chi-yue realizes the two of them have conflicting standpoints even though they are like-minded, causing her to face the conundrum of making life choices. In the meantime, Mik-hei astonishingly makes some decision for her.
Yeung Yut Ching, an elite in the bodyguard world, is good at risk management and is the winning team in life. However, his unhappy childhood made him refuse marriage, and fate made him meet Yau Tze Ching, a clever woman who keeps breaking the rules of his life.
The difficulty of buying a property in Hong Kong is the highest in the world. A supermarket manager who sold his property for cash during the 2008 financial crisis has chased property prices ever since to fulfill the dream purchasing a new flat for him and his wife.
Beauty KOL Ding Yau-ying’s sarcastic style has boosted his popularity. Lui Zi-tung, incoming group boss cum beauty brand CEO, is arrogant and egotistic. She finds out Yau-ying harshly criticizes her own brand products, and the duo pick on each other as soon as they meet. Because of an accident, Zi-tung’s brain is hurt, and her mind becomes like that of a kid. Zi-tung’s father Lui Zhen-ngok and assistant Sheung Cha-lai want Yau-ying and Zi-tung to pretend they are a couple so as keep the eldest son of the Lui household Lui Tak-shun in check. Cha-lai tries his best to help Zi-tung hide the truth, but he is threatened by Tak-shun, who finds some flaw. People around Zi-tung are touched by her sincerity and genuineness, and Zi-tung also reminds Yau-ying to never forget childhood innocence. The duo begin to have affectionate feelings for each other. While they live a happy life, Zi-tung’s brain condition deteriorates.