Dumbest drama I've ever seen !
And yet I watched series from different nations of Asia, Europe, Americas... from different eras, from black & white to color videos.

Comprehension, Image, Aura & Charisma, are the most important things in front of the camera.
Yang Zi & Xiao Zhan's eyes and expressions reflect 0 intelligence and 0 emotion in their interpretation, as in the official photos of 《The Oath Of Love》.

The job of an actor is to play characters that seem as realistic as possible.
That is to say : to participate in the scenario, give maturity to the dialogue, make it meaningful.

Physically and orally, Yang Zi resembles a young thirtysomething who wants to pretend to be a twenty-year-old but fails.
Xiao Zhan clearly doesn't have acting ability, he feels no empathy.

None of them have personally researched on the thoughts and talks of real doctors, shy students, families dealing with illness, depressed people & couples with an age gap.
However easy with such a simple scenario.

Only the OST were good.

I understand why it took Tencent nearly 3 years to release 《TOOL》.
When the quality is low, there is no rush.

Luckily, Tencent proceeded to do real auditions, & caught up in 2023 with its great science fiction series :
-《Three-Body》.
And that Chinese gem series like :
-《Reset》;
-《Minning Town》;
-《Tian Xia Chang He》;
-《A Lifelong Journey》;
-《Joy Of Life》;
-《The Knockout》;
-《Under The Skin》;
-《Our Times》;
-《Bright Future》;
etc... exist.

I still wish good luck to all the cast ?.