Idharkuthane Aasaipattai Balakumara

Kumar becomes the donor because his blood type matches the pregnant woman's rare blood type. When Bala accidentally hits the pregnant woman while driving drunk, doctors at the hospital determine she needs an emergency blood transfusion. After searching for a compatible donor, the medical team discovers that only Kumar possesses the matching blood type, forcing him into the center of the crisis despite having no prior connection to the accident.

Balakrishnan hits the pregnant woman because he is driving under the influence of alcohol. As a bank salesperson, he lives under constant pressure from his boss Poochandi and his possessive girlfriend Renu, which leads him to drink heavily. That night, his drunken recklessness causes him to lose control of his vehicle and strike the pregnant woman.

Annachi orders his henchmen to beat Kumar after learning that Kumudha does not like him. When Annachi uses Kumudha's phone to test her willingness to marry Kumar, she confirms she does not like him and that Kumar is merely bothering her. This rejection triggers Annachi to use violence as a warning to stop pursuing her, sending a brutal message to Kumar.

Kumudha's father Shanmugam approaches Annachi because he wants to stop Kumar's persistent stalking and obsession with his daughter. As the local wine shop boss, Annachi has influence and henchmen to handle such neighborhood problems. Shanmugam hopes Annachi can teach Kumar a lesson and keep him away from Kumudha.

The two storylines connect through the blood donor crisis triggered by Bala's accident. Although Kumar and Bala are strangers living separate lives, one obsessed with a girl, the other struggling with work and personal pressure, they become linked when the pregnant woman needs a blood transfusion. The hospital discovers only Kumar has the matching blood type, forcing their lives to intersect through this medical emergency.

Kumar fixates on Kumudha because he lives opposite her flat and develops an obsession from watching her daily. Despite being nicknamed "Sumaar Moonji Kumar" for his average looks and spending most of his time in TASMAC bars, Kumar harbors fantasies about Kumudha. However, his pursuit crosses into stalking behavior, which creates the central conflict with her family.

When Annachi tests Kumudha's willingness to marry Kumar through her phone, she clearly states that she does not like him and that Kumar is merely bothering her. This direct rejection from Kumudha herself becomes the catalyst for Annachi's violent response against Kumar, confirming that his affection is unwanted.

Finding Kumar becomes urgent because the pregnant woman is in critical condition and needs an immediate blood transfusion with her specific blood type. The hospital confirms that only Kumar possesses the matching blood type, making him the sole possible donor. Time runs out as the woman's life depends on locating him quickly.

Everyone searches for Kumar because he is the only person with the matching blood type needed to save the pregnant woman. Bala and his allies join the effort to locate Kumar and secure his donation without his consent. The desperate search creates tension as the clock ticks on the woman's survival.

Annachi serves as the local wine shop boss with enough influence to resolve neighborhood disputes through force. When Shanmugam seeks help to deal with Kumar's stalking, Annachi orchestrates a plan involving his henchmen. He uses his power to escalate situations, ultimately ordering the attack on Kumar after receiving confirmation that Kumudha rejects him.