Anyone know the OST song list for this drama?

I know there are a few Chinese drama/music aficionados in our midst who might be able to answer this question. I'm just curious to know who sings the songs, but it's been hard to find anything about this drama online.

Some of the music is quite nice! Thanks in advance for your help! 

I found these but no subs.

https://youtu.be/IHnScY3--W8?si=ZxonrD9CL9cOjTvi

Lost · Water Wing

Lyricist: The Silent King
Lyricist: Big lazy fish

https://youtu.be/9bWdrL7Y6jA?si=g_0gRomZ9jexprY1

Lost (accompanion) · Water chanting wind

The theme song of the web drama "Step By Step"

https://youtu.be/RZIhf7xMd4o?si=uXn0Nm7ZV0--3DJ_

Qian Pei Chen - If not, the network drama "Step deep" episode

https://youtu.be/WSxYGfgX9ts?si=9Glfre_BkiZyd1AN

Water Wing Feng - Lost (Theme song of the web drama "Step by Step")

https://youtu.be/KD-uSAc6to4?si=7qnOKDSJCglLm2ZX

Wang Jiao - Tell a joke (episode of "Step By Step")

I translated the titles and information online.