3bet pot with Kd8d

Pre I would consider folding. SB 3bets you quite big (4x) which is a bit weird. Could be a strong hand or then this is just standard for him. BB calls so I would guess his range is capped but quite strong. He should call with some semi high pocket pairs and broadways. The situation doesn't look good for you.
OTF you can't fold a top pair vs a single bet especially now that you have a BDFD to go with it and you are offered a great price. OTT clear call as well.
OTR I think folding is the best option. First reason is that you have a decent amount of better hands in your range. You sometimes can play TT,99 like this, T9s hits you and you have many better Kx combos too. Second reason is that I would perceive villain's play as quite strong and value heavy. The big 3bet, small turn bet on a not so dangerous card to take your money and then shove the river. Playing like this as a bluff wouldn't make much sense for me. Because of his small turn bet I would guess he doesn't mind if you call and he is not that scared.

Thanks for your opinion la55i.

Preflop, after his 3bet and the call from the BB, i get 3 : 1 for my call.
Don't you think this is a reasonable call with Kd8d ? Additionaly i have good implied odds and if i hit a two pair or a flush i can win a nice pot. What is your opinion on this?

On the Flop my opinion is, that i can find a fold here. SB bets into 2 people and BB calls. I can assume, that my K8 is behind ... and calling just because of my BDFD is too thin. What do you think?

The fold on the River is an obvios one... I talked myselfe into the call but after thinking about it now a bluff is very unlikely.

Since there are many more streets to come postflop, looking at the pot odds pre is pretty much useless. Chance of hitting trips or 2 pair is low and even if we hit a flush draw we would need to put more money in to the pot and we might be in -EV situation. It is true that we have implied odds but I would be more worried about the reverse implieds and domination issues. No matter what we hit, we can be beat. SB can have a nut flush draw and if we hit a K for example we can easily be dominated. With this hand I would say that the chance of losing big is high but the chance of winning big is small.

OTF it is close. I think calling a single bet especially in cases like this is fine when you hit a pair. Chance of improving to trips/2pair is above 10% and then you have that BDFD to go with it. We also can't assume we are always beat when villain bets. He could be cbetting AQ with BDFD or QJs and so on... You are right that the chance we are beat is quite high, but then again we don't have to win this hand very often to make a profitable call here. The fact that you are considering folding OTF when you hit a top pair proves the point that calling preflop was bad.