Gong Yoo's IF line from "[Volleyball Boy] Hot Love".
You need to read Chapter 11. If you haven't read it, it won't have much impact.
Preliminary summary:
After Arima Chika entered her senior year, she broke up with Miya Yu because of her low self-esteem. However, she was unable to take a good rest due to the pressure of the job search period and the emotional retaliation after the breakup.
Until this night - she lay down in front of her desk after taking a shower, and in her dreams she could see Gong Yoo's red-eyed face asking her "Why did we break up?"
Intention: No if
