
ummm does Guanshan know by accepting to wear He Tian's studs without ever taking them off means he agrees to belong to He Tian?
Also He Tian sulking on the bench over She Li hurting Guanshan LMAO. And how he keeps quiet when he thinks Guanshan is about to reject his demand because Guanshan says it's too conspicuous UGH

PLEASE TELL ME THIS IS TRUE SINCE MO HAS A THIRD PIERCING IN THE FUTURE.

http://www.mangago.zone/read-manga/19_days/bt/mpn_chapter-1871557/pg-1/
This chapter for example. Official illustrations show it too if you just scroll further back. But I was lazy and didn't want to search for the chapters hehe.

I'm talking about the Spoilers comment below. If you really want to know what happened here it is. SPOILERS ALERT
Tsugumi and Megumi get locked inside a gym and Tsugumi suddenly goes into heat. Megumi desperately asks him to use suppressants, fearing he will do something bad to Tsugumi but Tsugumi refuses to. Megumi then uses his willpower to stop himself from attacking Tsugumi, and he does it pretty well at first. He keeps asking Tsugumi to inject himself with the suppressant, but Tsugumi doesn't want to, and is getting more and more out of it as well (probably bc he kinda likes Megumi. They have a heart-to-heart talk about why they don't like having sex just out of instincts while Megumi is preparing to inject Tsugumi with the suppressant. However, as they talk, Megumi falls for Tsugumi, and loses control himself, so they have sex. Tsugumi kind of refuses to, but he doesn't struggle against Megumi's embrace. Megumi is then deeply sorry and thinks that he has raped Tsugumi, to which Tsugumi (in later chapter) responds that it is actually mutual and voluntary on his part.

I've read the raws. And perhaps a legit Chinese speaker can correct me on this, but I think in the raws, when Yuyang's father gave Li Huan the red envelope and Huan's father said "Isn't this too big?" (as in complains that Yuyang's father shouldn't give Huan so much money), Yuyang's father responded "Don't be so polite. I'm giving it to my own son." (The exact translation is "There's no need (for you) to be so polite when one is giving money to his own son"). Li Huan then replies "Thank you, DAD." (and not "sir" like in the translation uploaded).
Again, maybe there are subtleties that I missed. Perhaps calling your significant other's father "dad" just means "sir" in some cases? But Li Huan definitely used the character "dad" to address Yuyang's father.

Hi! Thanks for pointing it out!
I asked about those to a Chinese friend of mine, and the answer was, for the first topic, that a rough translation for Mr Yu's answer would be "Giving a red packet to one's own son is standing in ceremony", meaning more or less what you said, using a bit too much politeness that it would become out of place for a father and son, that are no strangers to each other. Zero_0_0 already pointed out a better translation for that -- I should fix those in the next few days.
The second situation, when LiHuan calls Mr Yu "dad". Yeah, that's precisely right. A boyfriend/girlfriend might call their in-laws as dad or mom, same goes for closer relatives, like a brother/ sister... But for brother and sister, you don't really need to be in a romantic relationship with another person.... You can see some of those situations in other manhua, like 19 days.
Those situations are a bit of a pain to translate. When I see that a situation might leave some doubts about who's the father and who's the son, for example, I tried to leave it more neutral, since I hate making those little translation notes under the pannels. But Zero_0_0 advised me to use a end-of-chapter Translation Note and leave our dear cinnamon roll calling Mr. Yu as "dad". Sounds nice, right?
hihihi
dat boy blu so cute~

SPOILER ALERT
It's New Year special and they are now in a steady relationship. Li Huan's dad gives Yuyang a red envelope and Yuyang's dad gives one to Li Huan, whom he calls his "son." (It's a tradition to give money in a red envelope during New Year in China). Yuyang and Li Huan are lovey-dovey as hell. LH says his new year wish is to be together with Yuyang, to which Yuyang replies that they're already always together. But Li Huan whispers in YY's ears that he wants to be with him "tonight," so YY kisses him. The kids make fun of them, and YY playfully argues that there's nothing illegal about kissing his own bf. YY then asks LH to follow him, which initially confuses LH, but then YY explains that they should go see if there are any vacant hotel rooms.
I'm dead.
The chapter should have ended with He Tian looking all smug and says "I'll buy you anything you want."