
Not exactly what you call a happy ending so major spoilers ahead
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so fall comes in and hajun and candy are still together. Stuff happens, ranging from Candy's co worker (the brunette) liking candy ever since he saw him at a bar, Hajun finding out that candy is the boy he was looking for all these years from the truck accident, Hajun getting shot, his dead beat dad's reveal and the most anticipated part is Candy's reveal to Hajun.
Im not well versed in Korean (hardly understand it) but this is what I gathered.
So Candy received a call from his boss, supposedly from his mission, and while they were talking on that dumb phone Hajun comes and hears everything. What ends up is a teary reveal, Candy telling Hajun the truth before knocking him unconscious on the side of the road. Running away with tears in his eyes.
After Hajun wakes up and finds out that Candy ghosted on him, I assume, he takes a break or resigns as a professor and the cycle begins again as he looks for Candy once, now knowing who the boy in the accident really is. The perspective shifts to Candy, as he lays on the floor surrounded by dead bodies. He looks like he's reminiscing the past from the way he was looking or just shocked.
Either way, I like to think the author lets us imagine the rest of the story. Like Carol & Tuesday but maybe I'm wrong.

I don't think candy revealed everything to hajun. He just warned him to be careful (not to be alone, leave the house, not let anyone get close to him easily etc) and to forget everything they have done together as if candy never existed in his life. And about the last scene I think candy is at an auction. I think uno mentioned it some chapters ago?
red candy ends in another 30 chapters.