Romance - Multiple Couples

• Jin Goo (Seo Dae Young) + Kim Ji Won (Yoon Myung Joo) - Captain's daughter

• Lee Dong Wook (Grim Reaper) + Yoo In Ah (Sunny) - cafe owner

• Kim Min Gue (Cha Sung Hoon) - ML's asst. + Soel In Ah (Jin Young Seo) - FL's BF

• Kim Jung Hyun (Goo Seung Jun) - sly spy + Seo Ji Hye (Seo Dan) - princess complex

• Park Byung Eun (Ma Sang Goo) - ML's co-worker + Esom (Woo Soo Ji) - FL's friend

• Wa Hi Joon (Ji So Joon) - artist + Jung Eugene (Song Hae Rin) 
• * Kang Gi Doong (Park Hoon) - Marketing + Park Gyu Young (Oh Ji Yul) - ditzy rich girl
• Jo Han Chul (Bong Ji Hong) + Kim Sun Young (Seo Young Ah) - ex married couple
• * Kim Tae Woo (CEO) + Kim Yoo Mi (Director) - unofficial couple I loved together

Ahn Bo Hyun (Nam Eun Gi) - Judo & Kim Bo Ra (Cindy / Kim Hyo Jin)

• * Jang Woo Young (Jason) + IU (Kim Pil Sook)

• FL's sister & teacher @ FL's school

• * FL's friend & heart condition classmate

• FL's friend & tough guy

• * Matsuda Shota (Sera Ojiro)- photographer + 

• 2 females couple
• Friends w/ benefits couple

• 2 females couple
• 2 students - sculptor & girl who has no strings attached relationship

• Pregnancy difficulties couple
• Fighting marriage issues couple
• FL's brother & ML's sister

Jung In Kyu (Easygoing ML2) + Kwan Min Ju (Quiet FL2)

• Duan Mu Bai (ML's love rival) + Chi Hong (Female pirate)
• Qian Da You (ML's underling) + Chu Feng Ling (princess)

• FL's crush + FL's BF
• Ex warrior w/ limp + captive w/infant
• FL's servant + ML's asst

2 MLs & 2 FLs

• Time traveler + Cellist
• * Band Leader + Def girl

• Princess who is n/chosen by ML & ML's Assistant

• Grandma & new boyfriend

• * Han Ki Joon (drummer) + Bul Ja (illegal alien)
• Yoo Han Chul (cancer band member) + Mina (artist, $ searcher)
• Park Sang Deuk  (heartbroken drunk) + Yoon Mi Young (Sang Deuk's ex)
• Han in Ki (ex-guitarist)+ Kim Soon Boon (social butterfly)

• Maeng Ha Na (eldest daughter) + Crown Prince Lee Jae
• Maeng Du Ri  (aggressive daughter) + Lee Shi Yeo (hot mamma's boy bachelor)
• * Maeng Sam Soon (writer daughter) + Jung Soon Goo (FL's Bro)
• Jo Ye Jin  (FL's sis-in-law) + Yoon Boo Gyeom (noble farmer)
• Yeo Joo Daek (saved at river) + ex-prison guard 

• Sa Wol (FL's servant) & Hong Sung Pyo (ML's asst)

• Park Bok-Kyo (ML's Asst) & Shin Da Jeong (FL's Asst)

• Jo Eun Sub & Goo Seo Ryung

• (FL's sister) + (Sister's friend)
• (ML2, Mtn God) + (Girl who prays to him)

• Chef & ML's sister
• ML's asst & newly promoted manager
• FL's ex & FL's BF

• FL's 2 older bosses
• ML's parents

• the couple main leads meet at their wedding

• ML's Asst & FL's coffee cafe owner friend

• FL's maid (entrepreneur) + Older brother (Defense Secretary)
• ML's boss's daughter + ML's coworker/asst.

• FL's oldest Bro & FL's BF
• FL's Mgr & Co. President

• FL's BF(choclatier) & ML's college Sr. (corky researcher)

• ML's co-worker/BF(flirty playboy) + another co-worker(love/hate with ML's BF)

• Kwan Min Woo + Choi S00 Yeon = enemies to lovers between lead's co workers

• ML's ghost worker & FL's BF

• ML's & FL's classmates (become actors)

• Bai Yu Ze + Ding Ming

• * Park Soo Kyung & Lee Jin Sang

• ML's younger 1/2 bro + convenience store employee girl
• ML's sister + ML's BF

• ML's brother + live in girlfriend
• ML's BF (dog role play) + popular girl
• ML's lesbian BF + muscular girlfriend
• Popular classmate + his transgender girlfriend
• @ gay athlete classmates

• FL's BF & FL's brother

Story 2:  

• FL & 18 year friend/neighbor
• FL's BF & her ex-boyfriend

• ML's brother (gym owner) & FL's boss (single mom)

2 main couples - 2 escort boys & 2 college girls (1 cool & 1 dorky)

• FL's brother (webtoon artist) + ML's bodyguard
• FL's boss (fashion Designer) + ML's dad (troublesome)
• FL's dad (village leader) + prison boy's mom

• FL's Brother + Geisha / Assassin
• ML's servant + FL's servant

• Gay Brother + actor
• Sister-in-Law + evil cousin
• Sister-in-law + Husband's Asst.

• Married couple (lead's BFs)
• Hotel owner & ML's funny stalker

• FL's BF & ML's right hand man

• FL's BF (actress) & ML's Assist

• 2 Teachers (FL2 + PE teacher)

• ML's brother & female who is heads the family business.

• 2 Generals (FL's cousin & ML's general)
• Heavy General + ML's ex betrothed

• Laundry Mat girl & soccer ball cleaner/motorcycle guy

• Taiwanese girl + music loving guy
• Older geeky tutor girl + bad boy 

• King + Queen
• Queen Dowager + FL's dad

• ML's older brother & his arranged marriage wife

• FL's guy BF & ML's assistant 1
• FL's girl BF & ML's assistant 2

• FL's sister1 w/ FL's CEO
• FL's sister 2 w/ polyamorous guy
• FL's ex w/ FL's co-worker

• EMS Resonder + Reporter
• ML's Mom & Dad
• FL's Mom & Dad
• FL's Bro + ML's co-worker

• ML's Co-worker (urologist) + Firefighter/boxer
• Pastor + FL's roommate
• ML2  (Firefighter) + FL2 (Relationship columnist)

• Maternal Grandparents
• Paternal Grandparents
• Maternal Aunt #1 + Police officer
• Maternal Aunt #2 + Hospital worker

• Married couple w/4 kids (breadwinner + ex-con)
• Married couple (housewife + pharmacist)
• Single mom + black sheep son (beautician + college drop out)
• FL's BF + her husband (very small story arc)

2nd Couple - FL's sister & her boyfriend/husband

2nd mains 

• Mu Yao & Liu Fu Yi