Here are also the cast's IGs: 

Tape Worrachai Sirikongsuwan (Sun) - https://www.instagram.com/tape_worrachai/
Cho Si Hyun (Peace) - https://www.instagram.com/inee__d/
Choi Seung Ho (Jun Ho) - https://www.instagram.com/ccomi.__/
Ball Peeratad Promted (Kong) - N/A
Dom Petchthamrongchai (Nap)- https://www.instagram.com/dompetch/
Aton Thanakorn Techawicha (Tien)- https://www.instagram.com/aton_jk/
Top Piyawat Phongkanitanon (Gawin) - https://www.instagram.com/tppiyawat/
Khongkwan Woraphat (Jinny) - https://www.instagram.com/khongkwan_kk1/
Jinjutha Siripheng (Mei) - https://www.instagram.com/jinjutha_jajaa/
Phanthipha Phongrueangrong (Cherry) - https://www.instagram.com/ladytruly/
Akadech Jaroonsot (Aim)- https://www.instagram.com/aon_akd/
Praphoom Wasurat (Tim)- https://www.instagram.com/phmmy_vas/
Bodinphat Aphonsuthinan (Jack) - https://www.instagram.com/myvvalker/
Paythai Ploymeeka (Tan) - https://www.instagram.com/payya/
Passin Reungwoot (Songphum) - https://www.instagram.com/apassin/
Ton Siradhanai Panthrap (Joe) - https://www.instagram.com/tonsira_7/
Phee Phiangphor (Jinhoo) - https://www.instagram.com/pheephi__/
An-Jung Won (Wongi) - https://www.instagram.com/eunjongk_/
Russamee Thongsiripraisri (Yao) - N/A
Hwang Junsu (Seong-hoon) - https://www.instagram.com/h_junsu_/?hl=en
Choi Jae Won (Chin Woo) - N/A

Here are the missing ones:

Ball Peeratad Promted (Kong) - https://www.instagram.com/ppreme.prt/?hl=en

Russamee Thongsiripraisri (Yao) -  https://www.instagram.com/lookmeerussame/?hl=en

Choi Jae Won (Chin Woo) - https://www.instagram.com/lunagettingcloser/?hl=en

Does anyone know who the actor of the orphanage headmaster is?