"Will you teach me, Professor Jinki? How these cells-the neurons. How they work? I’m afraid I’m going to be behind the other students when I transfer. Unless you tutor me, of course”. 

Jinki is sick of unrequinted love, it only lead to a broken heart. Unbeknownst to him it could be fixed, but who knew jealousy would be the answer? Sequel to "Lifetime", but the fic can be read without it. 

Lee Taeyeon employs the service of "Heart's Tuner", a courier of sorts that delivers serenades conveniently right at your doorstep. She has been trying to capture Choi Minho's attention for years now and has come up with this plan as her last resort. Hopefully, this will help encourage him to confess his (non-existent) feeling