Liliana Aries Dela Cruz, Aries for short, a carefree girl with an obsession for the color pink, has been best friends with Kiel Sadueste for 10 years. Mga damit, kuwarto niya, kahit mga gamit niya ay makikitaan mo ng kulay pink; na siya namang kinaayawan ni Kiel. Halos kalahati ng buhay nila ay magkasama sila, through ups and downs, away bati, asaran, talagang hindi sila mapaghihiwalay.
Hanggang sa isang araw, Kiel reveals that he's now inlove with someone. He wants Aries' help to win her over. Hingi advice, taga plan ng surprises for her, at taga motivate. Lahat ng gusto nito, ginagawa at sinusunod niya, for her best friend's happiness. Basta masaya si Kiel, masaya din siya lowkey.
Will they win her heart? Will their plan's status be 'OPERATION: SUCCESSFUL'? Or the other way around?