I'm not familiar with any of the songs you asked for, Ryumia, so I may not have chosen parts that make them recognizable. Let me know if you want me to do a different part than the ones I chose, and I'll be happy to make more town tunes for you.
Anyway, here is "Lovelyz That Day":
A-----AD
G---zzzz
All the high notes or all the low notes will work.
Here is "9 (fromis9) - To Heart Piano Cover/Sheet music":
DD-DED--
DD-E-D--
All the high notes or all the low notes will work.
Here is "(fromis_9) (Glass Shoes) Piano Cover":
EDCG-EDC
EDCG---z
High G, all other notes low.
Here is "PRODUCE 101 | - I Know You Know Piano Cover":
CC---CCC
CC----zz
Either high or low C will work.
Here is "PRODUCE 101 |NEVER Piano Cover":
F--FG-GA
--AA-G--
All the high notes.
Here is "PRODUCE 101 (Pick Me) Piano Cover":
D--DD-CD
---FF-EF
All the low notes.
Here is "JBJ - (Call Your Name) Piano Cover":
E---D---
G---C---
High G, all other notes low.
Here is " (PRODUCE48) - (PICK ME) Piano Cover":
EEA-EEA-
EEA----z
Low E, high A.
Here is " (GFriend) - (Summer Rain) Piano Cover":
FDFDFDF-
G---zzzz
High G, low D.
Here is "(GFRIEND) - (Time For The Moon Night) Piano Cover":
DFGA-A-A
-A-G-GC-
Low D, all other notes low.