Surprisingly this is a good drama, the best of this drama was the casts. Everyone had genuine smiles and great collaboration between them. I would give credit to the main actors who made this drama special.

Ryeoun as Ha Eun-gyeol
The only hearing person in a deaf family (Mom, Dad, & older Brother). Eun-gyeol was a perfect model student by day, but at night he lead a double life as a talented guitarist in a band. After having an argument with his father, where his father learned of his musical interest, he time slipped to 1995 and met his parents when they were Junior in High School. He surprise to know that his dad wasn't deaf but a hot-blooded youth whose in love with a girl from Seowon Arts HS, Choi Se-kyung: a student major in cello not his mother. Eun-Gyeol also learned there's accident causing his father lost his hearing and stirred his attention to the deaf girl Yoon Cheong-ah as he knew her as his mother. He strive to create a different outcome of his parent's future and to avoid the accident. ***Ryeoun was a delight to watch, he's not only great play guitar but also sign language, it wasn't fake sign language - no! He knows it well. His expression was excellent & great smiles, speech deliverance is awesome.

Choi Hyun-wook as Ha Yi-chan
A hot-blooded youth whose worry nothing but so cheerful and confident. He lives with his grandmother who owned an accommodation house named Snail House. He's in love with beautiful Choi Se-kyung: the cello goddess of Seowon Arts High School. Choi Hyun-Wook made a bet with Se-kyung he would be in a band and made her girlfriend. The bet was on, but out of the blue a crazy boy Ha Eun-Gyeol show up challenged him of her heart. With some reason that strange boy Ha Eun-Gyeol kept follow, helping & protect him. He finally warmed-up to him and they became good friend. ***Choi Hyun-wook is full of energy, has beautiful voice, good in play guitar.

Seol In-ah as Choi Se-kyung / On Eun-yoo
Se-kyung was a person considered to be everyone's muse with her beauty, talent and elegant aura, but she would have an unhappy marriage that made her a controlling mother to her only daughter On Eun-Yoo. Eun-Yoo was on the same situation as Eun-Gyeol, she determined to change her mother's love life so she would have a happy marriage, she looked for the man of her mother's first love. Eun-Yoo and Eun-Gyeol had an understanding to help each other shaping different destiny for their parent. ***Seol In-Ah beauty and sunshine character are significant with character she's portraying.

All ends well, great drama.