UPDATE 2

Initially feeling lazy to post an update regarding this issue, but this may help to be a future reference for people who faced similiar problems and wanting to know feedback regarding this issue. So here it goes.

During the duration of repair, I have called the service centre approximately 5 times, each time asking for the status of progress regarding the repair. Here are the details regarding each call:

Call 1: Requested additional parts from Lenovo HQ after diagnosis of the problem, awaiting reply.
Call 2: Requested replacement of motherboard approved from HQ, pending arrival of parts, ETA the same week.
Call 3: Replacement motherboard unit is faulty, unable to turn on laptop, 2nd request from HQ for new motherboard, again ETA the same week.
Call 4: 2nd Replacement motherboard also faulty, causing BSOD for unknown reasons after certain period of time, request from HQ for new motherboard, no ETA.
Call 5: ETA of new motherboard by the same week. (Specifically requested it to be done by the following week as my old HP laptop is having issues)

A week after the fifth call, they called and notified me that my laptop is ready for collection (June 11), which makes the whole duration of repair 2 months, a month longer than expected (may be absurd for some as typical laptop repairs only take about a week or so). Went for collection, checked for any damages, and left after signage of documents. The staff there handled the situation well with a smile and explained everything patiently.

However, the 4 little lightbulbs which indicate Power, Battery, Disabled Mousepad, and Caps Lock seems to be dimmer than usual, although not an issue but deserves to be pointed out.

IMO, I dare not falsely accuse the Lenovo Service Centre for making up excuses for the delay of my laptop repair, but the reasons given in all 5 calls seem oddly suspicious to me as it sounded as if they are making up excuses for the delay of the laptop. Therefore, my advise to anyone whom is dealing with Lenovo Service Centres to strictly request the laptop to be done in the shortest time possible, thus making it seem urgent and they might provide you with a speedier service.

Anyways, thank you so much for everyone who has been helping me through this, and I already bought a Macbook during the wait, thus making it bearable for me.