Adai who has low intelligence quotient (IQ) stays with her foster father, Gong Jia Qiao and her son Zheng Xiong in an HDB. There is a solitary elderly Ma Sai who suffers from depression living alone under them. When Xiao Gang Dang gets released from jail, his best friend, Mei Da Han brings him to Geylang to have some durian. However, Qing Qing misunderstands that he was engaged in vice activities.低智商的阿戴，与养父龚家翘及儿子正雄过着简朴的日子。楼下住着独居的孤僻老人马赛，患有忧郁症。

Adai goes against Jia Qiao to buy an electrical Scooter for Zheng Xiong. Jiao Qiao bumps into his younger brother Qing Hu and ends up having a meal with him and his wife Mei Rou. Mei Rou belittles him during the meal. Gang Dang bumps into Ma Sai on his way to buy 4D; Ma Sai receives a scam phone call. To save Ma Sai from the phone scam, Gang Dang cheats Ma Sai's money.

Due to a perpetual knocking sound coming from upstairs, Adai tries to confront the neighbours but there is no one at home. Gang Dang meets Qing Qing again, and more misunderstanding arises. Out of anger, Bai Bai splashes fruit juice onto Gang Dang. Gang Dang goes to the community center to clean up, and Adai mistakes him for her lover. Out of empathy, Ma Sai wants to keep Gang Dang in, and Qing Qing strongly objection. Gang Dang and Qing Qing...

Jia Qiao and Adai feel sad and guilty for the death of the Ah Ma upstairs. Ma Sai finds Gang Dang a good man, and takes him in. The next day, he discovers some money is missing and suspects Gang Dang. When Qing Qing is visiting Ming Guang when she realizes he had locked himself in. Qing Qing then asks Gang Dang to help break the lock. Qing Qing wants to pay Gang Dang but he refuses to accept, saying that he would rather Qing Qing owe him a favor.

Bai Bai relieves a class, and she receives help from a mysterious guy who helps her solve hard questions through messages. She realizes the mysterious guy is actually her ex-boyfriend, Mei Da Han, whom she has not seen for a long time. Qing Qing shows concern towards Gang Dang and Gang Dang starts to fall for her. Adai brings Zheng Xiong's wallet to pass it to him at school, but Zheng Xiong doesn't wish to acknowledge her...

To help Adai come to her senses, Gang Dang bring her to her father's cinerary urn. Adai is devastated and can't accept the fact. Bai Bai offenses a wealthy woman unintentionally, and it turns out she is Ouyang Ming's mother, Xiang Yi. When they meet again, Xiang Yi seems to have no impression towards Bai Bai, and this makes Bai Bai feels uneasy...敢当为了让阿戴醒悟，只好带她到父亲的骨灰坛，阿戴晴天霹雳，一时无法释怀。白白无意得罪了一名富婆。孰料，富婆竟是欧阳明的母亲香怡。。。

Mei Da Han sells health supplements to Ma Sai. Gang Dang realizes the supplement is actually plain water but Ma Sai refuses to believe it. Qing Qing recommended a lot of business to Gang Dang. As a token of appreciation, Gang Dang decides to treat her a meal. Rex and Zheng Xiong are having a conflict. Out of sudden, Rex takes a knife to stab Zheng Xiong. Adai blocks the attack and Rex ends up stabbing her... 梅达瀚向马赛兜售营养液。敢当发现马赛买的营养液只是自来水，但马赛不...

Adai gets injured from saving Zheng Xiong and he is touched by her act of motherly love. Gang Dang asks Qing Qing out for a meal, but ends up not turning up as he is helping Adai with her injury. Bai Bai is trying to test Xiang Yi whether she has dementia, but she gets embarrassed by Xiang Yi instead. Xiang Yi admits that she does not want Bai Bai to be her daughter-in-law, Bai Bai is shocked by her words. 阿戴为了救正雄不幸受伤，正雄为此被阿戴的母爱感化。。。

Bai Bai knows Xiang Yi is always acting in front of Ouyang Ming just so that he will get the impression she is overly suspicious. Then, Bai Bai sees Xiang Yi picking up a photo in the middle of the road, and a car is driving towards her. Bai Bai tries to pull her aside, but Xiang Yi pushes Bai Bai away and gets knocked down instead. 白白得知香怡一直在欧阳明面前演戏，目的是让欧阳明以为白白疑心病重。后来，白白看到香怡在马路中央捡照片，而一辆车正朝着她行驶，白白马上拉走香怡，但香怡却推开白白，而自己被撞个正着。

Bai Bai sends Xiang Yi to the emergency department, but it was too late. Ouyang Ming asks Gang Dang to come see Xiang Yi for the very last time. Gang Dang hesitates and misses the chance to say goodbye. At Xiang Yi's funeral, Ouyang Ming blames Gang Dang for being ruthless and decides to disown him. 白白送香怡到医院急救，但抢救无效。此时，欧阳明求敢当来见香怡最后面，但敢当迟疑，最后错过和香怡相认的机会。在香怡的灵堂，欧阳明责怪敢当绝情，打算与他恩断义绝。

Ouyang Ming plans to bring Xiang Yi's ashes back to Hong Kong and is still unwilling to forgive Gang Dang. Ma Sai feels pity towards Gang Dang and tries to comfort him. As a result, they become closer, like father and son. The next day, when Gang Dang tries to wake Ma Sai up, but he realizes Ma Sai had lost his consciousness. 欧阳明打算把香怡的骨灰带回香港，而他依然不肯原谅敢当。马赛同情敢当，便安慰他，由此两人的关系渐渐亲近，如同父子一般。但隔天，敢当叫马赛起床时，却发现他不省人事。

Gang Dang performs CPR on Ma Sai and saves his life. Gang Dang realizes Ma Sai is too reliant on the "supplement" and has not been taking his actual medicine. If he continues to do so, there will be a chance that he will have heart attacks. Bai Bai discovers that Da Han is the seller of the fake "supplements" and she is extremely disappointed by him. When Ma Sai is about to discharge, his son De Liang comes back to visit...

De Liang realizes Ma Sai is ok. He blames Ma Sai for making him rush back and the two part angrily. Gang Dang records De Liang's voice to remind Ma Sai to take his medicine. This touches Ma Sai. Da Han asks Bai Bai to wait for him. Ouyang Ming realizes Da Han is Bai Bai's first love and he gets affected by it. Mei Li and Zheng Xiong are having a great day out, and she wants to bring Zheng Xiong to France to live with her...

Mei Rou discovers she is pregnant. However, Qing Hu doesn't mend his ways and this makes her sad. Ouyang Ming declares his love for Bai Bai and vows to marry her in 100 days. Gang Dang summons the courage to ask Qing Qing out, and they finally become a couple. Mei Li goes for a makeover so that Adai will recognize her. At last, mother and daughter accept each other...

Qing Hu steals a diamond bracelet to pawn and this causes Mei Ruo to run away from home. Bai Bai and Qing Qing invite Ouyang Ming and Gan Dang separately for dinner, hoping they can reconcile. Ouyang Ming breaks the ice, and they make up. A drunk Da Han sings a love song at the hawker center. A passer-by records it and posts it online. He becomes an overnight sensation online...

Qing Hu discovers Mei Ruo is pregnant. He hunts her down and the two finally reconcile. Jia Qiao feels sad living alone but is overjoyed when Adai is back. Ma Sai feels disappointed at De Liang so he decides to leave his assets to Gan Dang after he dies. Bai Bai finds out the reason why Ouyang Ming escaped the wedding, but she could not find him. Three years later, during Gan Dang and Qing Qing's wedding, Ouyang Ming returns... 清湖发现美若怀有身孕，，，