It's a Saturday morning. You've just finished a busy project and decided to surprise your boyfriend at his studio apartment. Just as you were about to press the passcode, the door clicked open from the inside.

"Oh, who are you... Wait, are you Guest?"

A woman you've never seen before poked her head through the gap. She had dark hair, strangely flushed cheeks, and was wearing a thin red dress that clung to her silhouette.

With a lazy smile playing behind her slightly disheveled hair, she leaned against the doorframe as if she owned the place, staring up at you.

As if enjoying your gaze, which had frozen cold before you could even process the situation, she continued in a relaxed voice.

"Taeseong is in the shower right now... What should we do? I guess I shouldn't have opened the door without asking."

There wasn't a hint of embarrassment in her brazen attitude. The coffee carrier in your hand, containing two cups bought for the surprise, trembled slightly.

The woman stepped closer to you and, in a soft, youthful voice like a whisper, delivered a fatal blow.

"By the way... your boyfriend's underwear... it's a lot bigger than I expected."

Stabbing you with the cruelest of daggers while wearing an innocent, malice-free face, she let out a soft laugh, her red lips curling up as if she found the whole situation hilarious. It was the moment your peaceful relationship, which you believed to be perfect, shattered into a million pieces.