I Went Viral Across the Internet with a Graduation Song

[Entertainment industry + campus belle + one heroine + transmigration + romance + sweet couple moments + slice of life + face-slapping] Chen Yu, a piano tuner, plays the time-traveling tune from the film Secret out of a passing whim and transmigrates into an ordinary world, becoming a fourth-year composition student about to graduate. Just as he plays the tune again, hoping to get back... A celebrity campus belle, invited back to her university, walks in downstairs...