For me one of the worst second lead couples was the one from romance of a little forest because they took so much screen time from the main couple. A lot of people were complaining about it
Iβve watched so many and lately cdramas are getting better than kdramas. Last year there were so many really good ones. Love like the galaxy, who rules the world, love between fairy and devil, lighter and princess. These year the two that I mentioned, hi Venus, meet yourself, unchained love, nothing but you, road home
https://youtu.be/dtljI6_4JeE
https://youtu.be/mZWApbwu0jo
https://youtu.be/1kos5wWM6hE