
should I read the novel? does the novel give more details? If so I want to read it from chapter1

The novel really did have more details. You'll get the feeling of the disappointment they had with T1, how hard the group worked for their debut, feel the uneasiness and anxiety BSJ and PMD are feeling. Just whole lot different. I feel like anyone who's going to or have already read the novel and then the manhwa will get to go inside and understand the DOD/RGW & PMD's world.
I find the blank expressions quite cute (and realistic??)
Swallow you whole (I think that what it's called) also had an ML like that. Kind of cute.
There's a Chinese one who stars a snake demon who is the total opposite lol.