The ranks, in descending order, are:
1. Chaophraya (เจ้าพระยา); the highest rank of the nobility and were appointed by the king.
2. Phraya (พระยา); historically also appeared as okya (ออกญา) This is Phop's father
3. Phra (พระ)
4. Luang (หลวง) Klao's father
5. Khun (ขุน)
6. Muen (หมื่น)
7. Phan (พัน)
8. Nai (นาย)
Phop's father and Klao's father are friend, they work in a public service and have a rank/title+name here
Phop's dad = Ok-ya PichaiPhakdee
Klao's dad = Luang PreechaPiban
Ok-ya and Luang are kind of title like "Lord" and name after that is not actually a really name, but a name from King and they usually call others just a title
P'phop's title is Muen Phop
People just call him "Tan Muen" (Tan ท่าน is like Mr.) with out his name
Introducing Tan Muen Phop
working in government service, patrol division, ministry of interior
DOB: 27 May
Blood type: A
Personality: Smart, calm, strict, looks like an adult but sulks deeply inside (especially when Nakhun ignores him), warm, gentle but strong. he won't look down on person who's lower than him, leadership but not dictatorship, monogamy
Favorite thing: Nakhun
Dislike: Unfair things, sweets, deep fried foods
Special skills: Singing, Poem
Introducing Nakhun
Faculty of Humanities, Major in English, junior
Name: Nakhun Phattanatada (Khun)
Nakhun means protected by goodness
DOB: 4 Dec, 20y/o
Blood type: B
Birthplace: Chachoengsao province
Personality: Lively, stubborn, naughty, headstrong, hardcore, open type
Favorite things: Every kind of foods, Kanom Kong*, doesn't eat strong taste food
Dislike: Tsundere person
Favorite flower: white adenium*(actually he doesn't like something specific but p'phop once gave him this, so he likes it)