Character Relationships in Twinkling Watermelon

Ha Eun-gyeol (played by Ryeoun) is a protagonist in Twinkling Watermelon. Youngest son of a deaf and mute family with a strong passion for music. After a heated argument with his father, he attempts to sell his guitar at a mysterious shop, accidentally traveling back to 1995. There, he befriends his father as a high school student, joins his band, and strives to prevent a life-altering accident. He helps a reserved girl learn sign language, uncovers that his love interest is actually his future sister, and ultimately reconciles with his family upon returning to the present. Ha Yi-chan (played by Choi Hyun-wook) is a protagonist in Twinkling Watermelon. Eun-gyeol's father in the present day, who is deaf and mute. In 1995, he appears as a high school student without hearing or speech impairments. He pursues music to impress a popular cello player and joins a band with Eun-gyeol. After being severely injured in a car accident while saving Eun-gyeol, he loses his hearing but eventually overcomes his disability to continue his musical dreams in the present timeline. Choi Se-gyeong / On Eun-yu (played by Seol In-a) appears in Twinkling Watermelon. A popular cello player in 1995 who initially appears reserved but becomes outgoing around Yi-chan and his friends. She is actually Eun-yoo, the future daughter of Choi Se-kyung, who also time-traveled. She develops romantic feelings for Eun-gyeol and successfully reunites with him after he returns to the present day. Yoon Chung-ah (played by Shin Eun-soo) appears in Twinkling Watermelon. Eun-gyeol's mother in the present day. In 1995, she is a highly reserved young woman mistreated by her stepmother and forbidden from learning sign language. Eun-gyeol helps her learn sign language with her father's support. She gradually falls in love with Yi-chan, and her father later provides financial support to Yi-chan's band in the present timeline. Eun-gyeol's Father (played by Choi Won-young) appears in Twinkling Watermelon. The present-day father of Ha Eun-gyeol, who is deaf and mute. He initially expresses disappointment over his son's music ambitions, leading to a family conflict. His past self in 1995 is revealed to be Yi-chan, who survives a fatal car accident due to Eun-gyeol's interventions and ultimately continues his musical journey despite his hearing loss. Eun-gyeol's Mother (played by Seo Young-hee) appears in Twinkling Watermelon. The present-day mother of Ha Eun-gyeol, who is deaf and mute. In the 1995 timeline, she is portrayed as Yoon Chung-ah, a quiet girl facing mistreatment from her stepfamily. Eun-gyeol's efforts to teach her sign language and support her lead to her eventual happiness and her family's positive influence on Yi-chan's future. Master (played by Jung Sang-hoon) appears in Twinkling Watermelon. The proprietor of a mysterious guitar shop where Eun-gyeol attempts to sell his instrument after quitting music, inadvertently triggering his accidental time travel to 1995.