He is cold, his teaching is tedious and his grading is brutally honest. He is the first critic any of his students will have. He does this to prepare them for the real world, where there are people much worse. Yoongi is observant, caring in his own way. He is honest, but never has the intention of hurting someone, just bettering them. He truly does care and love for his students, but only few get to witness it. He has a soft spot for you.