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That’s a famous drama starring Kim Hee-ae and Yoo Ah-in. It is legally on most platforms, but you can find it on Netflix (subscription) or rent/buy on Amazon/Apple TV. Some regions may have it on Viki with ads.
Their worlds collide when Sun-jae stumbles into a concert hall and plays piano, instantly captivating Hye-won. Recognizing his raw, untapped gift, she arranges for him to receive lessons from her husband. As she becomes his mentor, their connection deepens, and Hye-won, drawn to his charisma and passion, finds herself falling in love for the first time in her life, embarking on a dangerous secret affair that could unravel everything she's built.