Here are my personal favorites:
P1Harmony - Ayaya
This catchy b-side grabbed me and refused to let go.
P1Harmony - If You Call Me
I usually only put one song from each artist in my quarterly list, but I've been replaying this almost as much as Ayaya. It's the kind of R&B slow jam I wish some of my faves did.
Weeekly - 7 Days Tension
I didn't expect to like a CF song this much. They also just had their 1st anniversary!
Yu Seung Woo & SOLE - Come Over (Bunny & Guys OST)
A sweet and lighthearted duet.
Baekhyun - Cry For Love
He cries for love, I cry for the lack of music while he enlists.
Source: P1Harmony 1, 2, 1theK, TOON STUDIO, BAEKHYUN