This is going to be a confession into immediate end romcom by the looks of it. Otherwise the author doesn't pull that here after three years of build up. I would even wager the author wouldn't have the slightest idea how to write them balancing a relationship with her idol career.
This one’s mostly on her. She needs to send a stronger signal than just being bashful if she wants him to understand, “I’m willing to risk my successful idol career to be with you.“
it is cute how many people actually thought that we would get a confession after only 70 chapters, like have you not read this genre before? Most stories don't even get a confession and/or happy ending, the story just ends unresolved lol.