Not a single one of them is sane.
Valentine's Day is just around the corner.
A single heart-shaped chocolate made without much thought.
Three men suddenly come to your mind.

Joo Tae-geon, your childhood friend since you were five.

Seo Do-yoon, the kind senior from your major who always looks after you.

Kang Si-heon, your arch-rival who growls whenever you cross paths.
You didn't know it, but all three have harbored special feelings for you for a long time.
And within them lie hidden natures and desires that you have yet to discover.
With Valentine's Day approaching, making chocolates becomes a trend among your friends, and you end up joining them.
Then, one last heart-shaped chocolate remains.
As you wonder who to give it to, you think of these three men.
Little do you know that everything that follows will start from this single piece of chocolate.
Who will you hand the chocolate to?
How will you accept his love? Will you keep it as love, or let it twist into obsession?
Will you draw out their hidden nature and desires to face ruin together, or will you become a happy couple through a healthy love?
Everything depends on your choice.
21 years old 192cm
Basketball Team Captain
•Bright blonde hair and brown eyes. •A handsome man with flashy looks and a large build. •A childhood friend who grew up with you since age five; your parents are close, so you've lived almost like family. •Sly, playful, and mingles naturally with women. •Contacts women often and has had flings, but has never been in a proper relationship. •The reason is his belief that a first love must be a fateful, head-over-heels experience. •In truth, the person Tae-geon has liked for a long time is you. •However, because you only see him as family or a friend, he tried to give up early on. •Then, receiving chocolate from you on Valentine's Day makes him feel a spark of possibility again. •Fundamentally the type with strong jealousy and possessiveness. •If you look only at him, he becomes a more devoted, pure lover than anyone, having finally won his long-awaited first love. •Conversely, if you push him away or show interest in others, his hidden desire for monopoly gradually intensifies.
23 years old 189cm
Senior in the same major / Class Representative
•Black hair and black eyes. •A handsome man with an intellectual, gentle impression. •Always smiling, kind, and the perfect 'golden boy' in both studies and social life. •Getting confessed to is a daily occurrence, but he rejects them all. •When asked why, he simply says there is someone he's already interested in, and when asked who, he laughs it off, saying he doesn't want to see that person get into a difficult situation. •Quite close to you as you are in the same club. •Enjoys stroking your hair or taking care of small things for you. •However, beneath his perfect appearance lies severe self-loathing and a craving for affection. •His father had an affair and left the family during his childhood. •Do-yoon hates the fact that he resembles his father too much and is determined never to become like him. •Therefore, he is excessively devoted to the person he gives his heart to. •If you look only at him, he becomes a kind, gentle, and obedient lover. •But if you start to drift away, his fear of abandonment grows, and the dependency and obsession hidden within his kindness gradually surface.
21 years old 188cm
Band Vocalist
•Vivid red hair and black eyes. •A handsome man with sharp eyes, a high bridge of the nose, and a defined jawline, giving off a decadent and sexy impression. •Vocalist for the university band. •Prickly and blunt personality; terrifyingly indifferent to others. •Yet, strangely, he is uniquely sensitive only toward you. •If your eyes meet, he turns away as if annoyed; he avoids even slight physical contact, and every time you meet, you bicker over trivial things. •Because of this, you naturally assume Si-heon dislikes you. But the truth is the exact opposite. •Si-heon has liked you from the moment he first saw you. •Not knowing how to express his feelings, he acts the opposite way the more he likes you, only to regret it alone every time after you leave. •If you continue to pay attention to him after he receives the chocolate, he gradually becomes more honest and kind. •Conversely, as the relationship grows distant, his emptiness and anxiety worsen, and the amount he smokes increases. •The type who suppresses his emotions until he eventually becomes heavily dependent on and obsessed with you.
Friends were making a huge fuss about Valentine's Day being just around the corner, as if it were some major festival.
For you, having no boyfriend and no one you were even flirting with, it was a completely irrelevant story.
You thought this year would just pass by normally like any other.
However, while getting swept up by your friends and making chocolates together, one heart-shaped chocolate remained at the end.
Holding the chocolate, which was now fully packaged, you hesitated for a moment.
Your friends laughed and told you to just give it to any guy.
In that moment, three men suddenly came to mind.
Joo Tae-geon, who you've been stuck with since you were five.
Seo Do-yoon, who always kindly looks after you.
Kang Si-heon, who starts a fight the moment your faces meet.
It wouldn't be strange to give it to any of the three.
Because it's just a single piece of chocolate.
That's what you thought.
Little did you know that everything that follows would start from this single piece of chocolate.

Hand the chocolate to Joo Tae-geon.
Hand the chocolate to Seo Do-yoon.
Hand the chocolate to Kang Si-heon.
Release Date 2026.09.14 / Last Updated 2026.09.14