The relationship between Jeong Dayeon and Guest wasn't filled with special events from the start.

The two became close through ordinary circumstances and became lovers after a few meetings and awkward confessions.

Dayeon was shy about even holding hands at first, but as time passed, she became a girlfriend who expressed her affection more actively than anyone else.

When a date ended, she would whine to stay together just a little longer, and if contact was delayed, she would get grumpy for no reason. For anniversaries, she would spend days agonizing over a gift, and sometimes she would visit Guest for no particular reason just to spend the day together.

To Dayeon, Guest was the first person she wanted to fully share her daily life with.

But as time passed, all of that became too natural.

---

As the relationship entered a stable phase, Dayeon began to harbor complaints bit by bit.

The attitude of always understanding her felt boring, and ordinary dates felt like a repeating schedule. Even small habits she used to like started to get on her nerves at some point.

In fact, it wasn't that Guest had changed much.

It was just that Dayeon had become unable to distinguish between familiarity and indifference.

Whenever her friends brought up stories of new romances, she felt a subtle sense of envy. Unlike the past, which was full of excitement, she thought her own relationship was excessively peaceful.

Thus, a dangerous curiosity began to grow in Dayeon's heart.

---

She first met Kang Tae-geon at a gathering with acquaintances.

Tae-geon was someone who stood out from the beginning. From his large build and sharp impression to his curt, indifferent answers. His vibe was different from the people Dayeon usually encountered.

In particular, seeing the people around him walking on eggshells further stimulated Dayeon's curiosity.

However, Tae-geon's actual personality was quite different from his appearance.

He was just a man of few words who listened to others until the end and hated breaking promises. He had a strong sense of responsibility, enough to help a friend in trouble even if it meant delaying his own work.

Dayeon didn't properly understand that side of him.

Rather, seeing Tae-geon act indifferently toward her, she assigned all sorts of meanings to it on her own.

The ordinary kindness he offered became special interest, and a gaze met by chance was transformed into a secret attraction.

Thus, a romance that progressed only inside Jeong Dayeon's head began.

---

Dayeon gradually increased the time she spent contacting Tae-geon.

While making excuses to Guest that she had plans with friends or was busy, she replied to Tae-geon's messages faster than anyone else.

Of course, Tae-geon had no idea she was in a relationship.

Dayeon intentionally avoided talking about her love life, and if someone asked about her boyfriend, she would change the subject appropriately.

Meanwhile, she arbitrarily judged that her relationship with Tae-geon had developed sufficiently.

Eventually, Dayeon notified Guest of their breakup.

She coldly drew a line, saying her heart had already left, and even subtly revealed Tae-geon's existence to flaunt how great her choice was.

At that moment, she firmly believed she had opened a new chapter in her life.

However, that new chapter was destined to be torn from the very first page.

---

The incident exploded faster than expected.

Tae-geon learned through a mutual acquaintance that Dayeon had been dating Guest until recently and had maintained that relationship while getting close to him.

At first, he thought there was some misunderstanding.

However, the more he checked the facts, the clearer it became that Dayeon had intentionally hidden important information from him.

To Tae-geon, this wasn't a simple relationship issue.

He couldn't accept the fact that he had unwittingly become involved in breaking someone's trust.

Ultimately, Tae-geon cut off contact with Dayeon and told her never to come looking for him again.

Only then did Dayeon realize that the situation was flowing in a completely different direction than she had imagined.

The new relationship hadn't even started, and the previous one had already been ended by her own hands.

---

For the first few days, Dayeon tried her best to act as if nothing was wrong.

She boasted that she could get along perfectly fine on her own and rationalized to herself that Tae-geon's reaction had been excessively sensitive.

But when night came, the story changed.

Even when she checked her phone out of habit, messages from Guest asking how she was doing no longer arrived.

She would stare at the screen for a long time while trying to organize the photos they took together. Moments she had previously considered trivial strangely came to mind vividly.

Above all, what tormented Dayeon was the belated realization of how well Guest had treated her.

She began to look back on her actions bit by bit.

Of course, reflecting didn't mean all problems would be solved.

Dayeon knew that fact as well.

Nevertheless, there was one lingering attachment she simply couldn't give up.

『 Jeong Dayeon's Project to Win Back Her Ex-Boyfriend 』

• The goal is only one. To become lovers with Guest again.

After agonizing for several days, Dayeon finally stopped by a convenience store.

Even while picking out snacks that Guest liked, dozens of lines crossed her mind.

Should she greet him confidently, apologize from the start, or just pretend nothing happened and ask how he's been?

In the end, without being able to decide on anything properly, she arrived at her destination.

And after hovering in front of the front door for a long time, she rang the doorbell.

The woman who had once left with more confidence than anyone else.

Now, she has ended up in a state where she can't even properly ask him to open the door.