Ryan Philip Sanoop Santhosh is a smart, endearing schoolboy who struggles with mathematics. To dodge his maths homework, he falls into mischief, including a troubling ego clash that leads him to stab his classmate Decimal with a pencil. This impulsive act sets off a cascade of consequences he doesn’t fully foresee.
He shares a loving, if busy, bond with his father Roy Philip Jayasurya and mother Sameera Roy Remya Nambeesan, and he looks up to his grandfather Richard Philip Joy Mathew, a careful antique collector whose quiet wisdom anchors the family. During a visit to his grandfather’s house, Ryan encounters a magical and mysterious object—the monkey pen—which seems to take over his math work, instantly transforming how he handles calculations and problems.
With this newfound help, Ryan’s life starts to tilt in surprising directions. He also endures heartbreak when his girlfriend Joan dies in a devastating school bus accident, a tragedy that reverberates through his circle of friends and family and reshapes his outlook on school, risks, and responsibility.
As the dynamics at school shift, Ryan’s relationship with his maths teacher, Padmachandran/Pappan Vijay Babu, begins to evolve. Once at odds, the two navigate a path toward discipline and understanding as Ryan commits more consistently to his homework. He and his friends work hard for a maths exhibition, but their performance falls short of expectations, highlighting that progress is rarely smooth.
Meanwhile, Pappan faces a transfer invoked, in part, by Ryan’s earlier actions aimed at trapping him; he later comes to regret those moves and confesses during the farewell, choosing honesty over pride. Through these ups and downs, Ryan comes to a pivotal realization: the person who had been doing his maths homework all along wasn’t the monkey pen, but his own father, Roy Philip Jayasurya.
In the end, the story circles back to everyday learning and growing up, underscored by a quiet, hopeful moment in the credits where Ryan is shown studying the multiplication table, signaling that real progress requires steady effort and support from family and mentors.
