There is no pressure point linked to specific emotions. However, a lot of people tend to somatise anxiety and trauma, and that can result for example in extreme stiffness or chronic tension in muscles (not to mention chronic pain).
The mc feeling sad when a specific point is pressured is a bit over the top though. Unless this specific point is linked to trauma for some reason but it doesn't seem like it.
Acupuncture therapy is real but mostly I see it works because people don’t massage or stretch their body properly even tho it takes like 5mins a day . That plus stress, makes the body stiffen up and have knots .
Roll your back on a ball or a roller to hit the nerve spots, press down on glute muscles to relax them, massage along the band on the side of your thighs/legs
Afaik, acupuncture is based on pseudo-scientific postulates and uses needles to stimulate the energy flow of "qi". The main explanation for it "working" is the placebo effect, not a lack of massaging or stretching the body. Granted it has great historical and cultural value though.
However stress, anxiety and trauma do have neurobiological effects on your body and visceras and yeah, it can cause extreme stiffness (amongst other stuff). But in modern evidence-based medicine, it has not be proven that stimulating one specific part of the body causes for one specific emotion to be triggered. This sounds more like a spiritual, traditional framework. And i would say it is ok the author uses it this way here since this is a work of fiction, although it does feel a bit weird from a westerner pov
I honestly am just saying what I know about the traditional theoretical framework of acupuncture, which afaik is about energy flow and stimulation of acupuncture points, most of them aligned on meridians (which biological reality has never been proven). It doesn't have a scientific, evidence-based framework and that's what I was pointing at. If a webtoon describes its theoretical framework with the qi energy flow, elements and meridians, then it sounds to me it's describing its theoretical framework right. Because it is how it was originally theorized, even if modern medicine doesn't agree with its postulates.
After your answer I double checked, and I mainly see studies showing placebo effect.
Sure though, some acupuncturists have let go of the traditional Chinese medicine framework (qi, meridians) and attribute the few cases of pain relief to endorphin release (the moment needles are inserted), which a few study suggest might happen.
I don't see anything about pressure points though.
But we might also not be talking about the exact same thing, since acupuncturists may also use technics from reflexology or acupressure.
Anyway that was an interesting search, so thanks !

Is this kind of thing also exist in reality? Something like acupuncture points or something, because this is sound ridiculous in my eyes (who having normal life)