Watching or not watching is your choice and you are free to decide about it. Regarding characters, I would like to add my two cents. There is no one is this world who doesn't have flaws. No one is justifying their feelings here, but it is their flaw and they are fighting over it.
Everyone goes through a phase where they have a conflict of heart and mind. A guy who touches cigarette for the first time or a girl who shares her first kiss with her boyfriend, they all go through a battle within themselves. You can't say it is less wrong or that is more. Same is with KuNan.
50 years back pronouncing the word pad sounded a sin and today society is accepting movie like padman. I feel SBRK is just a show and it is telling a story. Try taking fiction like a fiction, your real life shall be in peace :-)