@Czakhareina Hey sorry for the late reply! If you have more dramas that would be nice its fine if you don't but some of the Chinese dramas you are asking for like Q series( With Chemistry) Also Le Coup De Foudre Secondary Couple is my favorite couple ever so but here you go:
My girl( Chinese not remake of Korean drama My girl)
Intense love
Everyone wants to meet you Open ending
Wife's lies( Daughter Seoyoung remake but in this Park Hae jin's charecter was nicer)
Well intended love
Ten years late
Flavor it's yours ( Taiwanese or Chinese cannot remember)
Love Now (Taiwanese must watch but long drama)
All I want for love
My Sunshine
My Mr. Mermaid( Forgot Taiwanese or not)
Lucky's first love
About is love
Girlfriend(He falls in love at first sight doesn't really count for sfl chasing ml)
Smile
Love Designer
My dear lady
Please love me ( Similar to Full house--not second leads story though but there is secondary couple)
Devil Beside you( Must watch Taiwanese Main and Secondary both cute)
Negotiator( Meh similar to across the ocean though, Happy ending though)
Glamourous times( Honestly sometimes frustrating but you might like it)
King of Blaze
Ice Fantasy (No couple moments or cute moments but she loves him he loves her The Ying Kong Shi and Yan da pair) Taiwanese I think
Handsome Siblings( Not really romance drama though she chases him like most of the dramas with exceptions)
Love the way you are( The couple that started my secondary couple obession)
Long For you
Cannot Hug You( Also meh)
Attention love ( I mean...)
Love is deep
To get her
Love of a thousand years (Sad ending)
Novoland The second part I think
Fantasy lovers ( They real cute and no major drama in their storyline)
Nice to meet you (Open ending; she started off as villian first)
Pretty man 2
Wait in Beijing( They lowkey weird like how it happened but The Female lead's ex boyfriend and Her best friend she isn't a stealer though; compared to devil beside you with same plot I can say I liked this best friend better but they had taken some time unlike devil beside you you can watch both or one I recommend Devil Beside you It's a classic)
OKAY THIS ONE I MUST RECOMMEND I'M SORRY ITS THAI ( Dw there's not like rape but like only watch for second leads)
They started my burning fire for Thai dramas with secondary pairings
Leh Ratree- Jespipat and Gypsy my real life OTP. In the drama though, they are respectively Fl's ex boyfriend/ kind of and ML's sister. They had cute moments together there shown very easily in the drama and have good screen time so it's not hard to spot them. They have really good chemistry.
Moving on
You are my answer
My love from the ocean (Villain Couple)
I've fallen for you
Love is sweet( I like main couple better though; reminds me of refresh man main couple's relationship they have amazing chemistry)
Sweet Combat (Most of the time they were both respectively vying for Male Lead and Female lead's love though)
Classic They kiss again (Christine and Ah jin) You bascially watch the first season for the main's but you then in second season for other couples like Christine and Ah jin
Masked Lover ( Taiwanese just like my upper selection)
Bu bu jing xin( I liked Scarlet Heart Ryeo more)
My amazing boyfriend
Princess Weiyoung
Bromance ( Ah a classic Tomboy drama)
Prince Coffee Lab ( I'm a fan of Coffee Prince and Xu Lu since she was in the wife's lies she plays main here and Coffee prince is the original story)
Inborn Pair( You might hate me but even though its huge I loved the secondary couples play out)
Better Man
Dear Mom
Love Family
Mogwli boy
Heart to heart( Idk Its just Idk lol)
Ten Miles of Peach Blossom ( I didn't really love it but anyways you might there's a sequel on them btw)
Ashes of Love
Unrequited Love ( Watch for Mains just telling you will like Main's better than Secondary Couple)
Another me
Chinese Paladin 5
Ode to Joy
Multiple Mains dramas ( Chinese) Most often has real life multiple couple stories by real life I mean something you as a person can relate to and not the rom com shizz
Okay I'm pretty much done since I have a memory loss brain I will tell you for more but basically Chinese if you have more or if you know someone who has more please tell them to leave a comment It would be amazing and Thank you and sorry for the late reply