Five Children has more than one couple, the others being the ML's adult siblings. It has been said that his shy sister's love story steals the show - and really shouldn't work given the very opposite male - but it does. The primary couple work together in the same department, and he accidentally becomes involved in her personal life. It's been a while since I've watched this one. The crossover to romance might occur around ep.15, not sure. He hasn't dated since his wife's death years earlier (lives with his wealthy in-laws who help with his young children and don't want the situation to change). She has told her own young children that their father is abroad rather than telling them he remarried.
I guess the thing is that given their situation, they know that any move towards romance will be a commitment.
I'd give it a try for a couple of episodes to see how you like it. This is one of the best family dramas.