The client wants the booking project to be all in JS Framework (not specifying any) and NO PHP since client hates PHP (and I don't know why) from the very beginning when the only dev was my former front-end partner (lead dev).
I was wondering why the client still continued the project, YET the file extensions were still on PHP. I asked the lead dev what happened and answered he didn't know know how to start migrating to JS framework and just started NATIVE PHP.
Still, as being a good dev and a supporter to lead dev, did accept and the project as lead dev's assistant. Fixed bugs, enhancement and responsive (DEMMIT, I FREAKING HATE RESPONSIVE) and later complained why am I doing front-end tasks, when it's not my task, supposedly. I EXPECTED MORE ON BACK-END TASKS!

(HERE'S THE EPIC ADVISE GOES AND CALLED OURSELVES MASTER)

Me: Master, why did you not started the project in JS Framework instead of native php?
Lead Dev : You know what master, this project has been already done if the client allows US to use WordPress for this project will still be migrated to JS. And now, WE are trapped to make every window size be responsive since there are already a standard for each window screen.
Me: (DO NOT INCLUDE ME IN YOUR FUCKING SORCERY! I DON'T KNOW WHAT YOU DID THERE AND WHY D'YOU ACCEPT THIS PROJECT, SLAVE, WHEN YOU ALREADY KNOW YOU DO NOT KNOW HOW TO DO IT, IN THE FIRST PLACE. STOP BEING A DICKHEAD AND DO NOT WASTE CLIENT'S MONEY AND EFFORT FOR YOUR USELESS BUNCH OF SHIT!) Indeed, responsive is a such a pain in the arse.
Lead Dev: Maybe, let's just finish our tasks first and wait the project to be migrated to JS.

P.S. The project manager and client asked me if I do know how to migrate the project from native PHP to JS framework and sabotaged lead dev. OFCOURSE, YES! But, I did not respond that quickly, unless eerm, you know, I earn greater than lead dev. Truth be told and practically speaking, it's really unfair for me if I accept the back-job when the lead dev delivers inaccurate deliverables and earned greater than me. No way, Jose!

Now, I am not working with him because I'm super done with him and later did I know, lead dev is looking for Drupal dev to be working for the booking project.