Yugure ni, Te wo Tsunagu (2023)

Both start with the cancellation of a marriage.
Both have the cohabitation trope.
Yugure ni, Te wo Tsunagu is kind of like a modernized Long Vacation.

Sena is a college music graduate who dreams of becoming a professional musician and a world-class pianist. Unfortunately, he has not been able to find any breakthrough opportunities and has to settle for currently teaching piano at a local piano school.

Minami is an out-of-work model. On her wedding day, she was dumped by her fiancé, and when she rushed to her fiancé's apartment, she finds out that not only was her fiancé Sena's flatmate but that her fiancé had also skipped town along with all her savings. Rendered penniless, she then moves into Sena's apartment, occupying the empty room that was her former fiancé's.

The two down-on-their-luck persons with very different personalities find themselves bonding over their similar situations in life.

It's been a while since I watched RIABB so I don't really remember the details but there was a wedding.
And then the leads did cohabitate together for a while.
And there's also the discovering one's passion part.

Both have musician male leads and female leads with strong personality. Both are platonic love stories that focus on helping each other achive their dreams.

Similar themes of chasing dreams and passions. About finding what excites you and betting your life on it.

Both shows deal with emotional themes such as love, loss, and regret, and both have moments of heartbreak and sadness as well as moments of joy and happiness.