
axdxex:
Like is Thai, Jun’s, actual brother/cousin/neighbor?
(re "My Stubborn") Good question, but my interpretation so far is that Jun was already good friends with Tai's younger brother Wynn, which might also be how Jun got the internship (?). If Jun were the actual brother of Tai and Wynn, and thus a third son of the company owner, he would be treated very differently.

axdxex:
If you find new understanding after rewatching the ep, please enlighten me!
I rewatched it, and although I'm not sure if I have any brilliant new insights, here are a few points that may help.
First of all, I tried to do quick-and-dirty translations of the otherwise untranslated screen text boxes as each of the many characters first appeared (here in the order that the screen texts appears):
Jun, 21yo, student intern: Cheerful, easy-going, easy to get along with except for one person (i.e. Sorn).
Tai, 26yo, eldest son of RT Design owner: Handsome, warm, caring, skilled.
Wynn, 21yo, youngest son of RT Design owner: Gen Z teenager - cheerful, lively, loves his friends.
Phe, 21yo, student intern: Hilarious, loves his girlfriend wherever he goes. (Does this refer to Aey?)
Aey, 21yo female, student intern: Cheerful, gentle, likes sports.
Phut, 24yo, RT Design employee : Playful, kind.
Penny, 24yo female, RT Design employee – human resources: Beautiful, sassy, iconic for the company.
June, 26yo female, RT Design employee – senior management: Sharp, strict, respected by people in the office.
Champ, 26yo, RT Design employee: Kind, gentle, loving, observant.
Sorn, 26yo, RT Design employee: Strong, fierce, straightforward person.
Korn, 23yo, RT Design employee: Office gossip, “unfiltered news unit”. (Walks into the bathroom on Sorn and Jun.)
Praew, 23yo female, RT Design employee: Office gossip, but more intelligent than Korn.
Then there are a few more characters without screen text boxes:
“James”: mentioned as head of import-export dept. and Jun’s “mentor” – or is this referring to Sorn, who in a subsequent scene seems to be acting rather like Jun's mentor?
Piangrak: blond guy, Jun’s boyfriend (at least for now). Will presumably be written out quickly to make room for Sorn, haha!
Pop (presumably not a significant character): Guy who comes into the bar, sits with Jun and Wynn, and hits on Jun, who then snogs him to make Sorn jealous, until Pop’s nasty, violent boyfriend walks in on them (= suspenseful end of episode 1).
So that's already 16 characters, and from the MDL cast listing it seems like we have a bunch more characters to come. Aaaaargh! In typical Thai BL fashion, they overwhelm us with tons of characters which may or may not be superfluous (not to mention the two little kids in the coffee shop). After watching a second time, I now have these sorted in my mind, which helps enormously.
A few more points:
(1) Presumably by copycat design, Sorn gives me strong Payu / Boss Chaikamon vibes, and not only because of the hair style.
(2) Based on the scene in which Sorn is snogging/screwing Penny as well as the later snogging scene with the random girl in the bar, I’m assuming that Sorn is a promiscuous playful bisexual ... until Jun ultimately wins his heart.
(3) People are deferential to Tai because he’s the owner’s son. Wynn (who arrives in the car with Tai) is his younger brother. As I wrote above, Jun seems to already be good friends with Wynn.
(4) Tai obviously likes Champ. They’ll presumably become a sweet side couple.
(5) With Piang now his boyfriend, Jun seems to have accepted himself as gay since the steamy opening scene with Sorn two years before.
(6) Regarding the scene in the company restroom, I’m not so into happy trails, so RXinw can have Sorn and I’ll take Jun. I think that’s fair.
So as to the remaining questions now in my head:
(1) I think I can guess how episode 2 will begin: Sorn will save Jun from Pop's nasty, violent boyfriend. Obviously!
(2) Who is the guy that Phut is snogging in the company stairwell? The MDL casting refers to Phut's girlfriend Vee and his "secret boyfriend" Yo - but we haven't been introduced to Yo yet, so was this yet another guy? Is Phut yet another promiscuous playful bisexual? In any case, it looks like this messy series is going to have some messy love geometries.
(3) The MDL blurb talks about Jun pranking Sorn (as the serious one), and yet in episode 1 we see Sorn pranking Jun. Is this role reversal, or just an atrociously written blurb?
Anyways, I like the series so far, not least because of the abundance of cuties. If it turns out to be a trainwreck (which seems likely), it'll probably be one of the strangely fascinating kind. I'm in!