The Ex-Morning

Both are GMMTV shows with famous casts.

Exes play a major role in both shows, considering the main conflict of The Ex Morning and Alan's complicated breakup with Wen in Moonlight Chicken.

Both shows also go between an adult and younger, school aged setting; in The Ex Morning we see flashbacks to the main characters' pasts, and Moonlight Chicken has a younger side couple that gets a lot of screentime along with the main, adult couple.

Similarities:
~ Both of them have the Exes to Lovers trope
~ Both of them showcases exes meeting up again years later in the workplace
~ Both couples were college sweethearts
~ Both couples broke up due to betrayal, mistrust, & miscommunication
~ One of the exes (Tamtawan from The Ex-Morning & Jin Hwan from Business as Usual) seem to be a red flag
~ Both red flags comes back to reunite with their ex and wants to work with him
~ Both red flags came back to their country (Thailand & South Korea) from studying aboard (Australia & USA)
~ Both shows mainly showcase the POVs of the other ex (Pathaphi from The Ex-Morning & Min Jun from Business as Usual)
~ Both Pathaphi & Min Jun are the best in their department (reporting & editing)
~ Both Pathaphi & Min Jun have not dated anyone since their ex
~ Both Pathaphi & Jin Hwan do not know the reason for their broken-up relationship
~ Both Tamtawan & Min Jun ghosted their ex
~ Cats are involved in the storyline (Min Jun & Jin Hwan wanted to own a cat during their initial relationship in college while Pathaphi & Tamtawan owned a cat during their initial relationship)

Differences:
~ One (The Ex-Morning) is a Thai drama and the other (Business as Usual) is a South Korean drama
~ Business as Usual (6 episodes being around 25 minutes) is shorter than The Ex Morning (10 episodes being around 55 minutes)
~ Jin Hwan & Min Jun (Business as Usual) dated for a few days (around a week) before they broke up and Pathaphi & Tamtawan (The Ex-Morning) dated for a few years (4 years) before they broke up
~ Jin Hwan & Min Jun (Business as Usual) reunited after around 8 years and Pathaphi & Tamtawan (The Ex-Morning) reunited after 3 years
~ Business As Usual is based on a web novel "Eul's Love" by Moscareto while The Ex-Morning is an original work and is loosely based on the actors' (Krist & Singto) real lives

Krist Perawat and Singto Prachaya both act in Sotus season 1 and The Ex-morning bl series, they are the actors who are the protagonist and a couple in both BL series. Also The Ex-morning has a lot of references to Sotus. Sotus and Kristsingto pairing are consider to be the ones to open BL to a wider audience and made companies in Thailand to continue producing Thai BL due to how popular Sotus became. Also they are the first official Thai pairing to be in a series where they are both the main characters in a BL series in Thailand.

The actors in The Ex-Morning are the main characters in episode 5 Our Skyy. In Our Skyy: Arthit and Kongbop almost broke up due to separation but in The Ex-Morning, which is a different series Krist and Singto are cast as Tamtawan and Padthapi where they are Exes. The Ex-Morning also has a lot of Sotus reference.

Sotus S is the season 2 of Sotus, Krist Perawat and Singto Prachaya both play the main characters in the story and act as a couple in both series. Sotus S is also references a lot in The Ex-morning.

Krist Perawat and Singto Prachaya both starred in I'm Tee, Me Too the series with Off, Gun, Tay and New. This is not a BL series but a bromance with 3 of GMMTV most famous official Thai couples/pairing. Story focus on Friendship and it's a must watch.

Both have Krist and Singto as leads. Both stories are based on workplace environment. Both stories feature stories of adults main leads.