Taekkyun is not precursor to TKD, however, many kicks were derived from Taekkyun.
I'll explain in this long write up.
I know many people either questions either if this was a game or a real martial art, but I'm not gonna get into that or try to prove one or the other, believe what you think, but it was both, depends on the setting.
Before Japan invaded Korea, Taekkyun was already quiet difficult to find.
Basically during Choson era, I am lazy to look up exact dates.
People who did taekkyun (commoners) had competitions and lot of social issues came w/ it. Basically it was fight for a bet.
For example: 2 people would fight and they would bet something or someone even of other party.
So one guy would bid that if I win I get your wife, one guy would want the other party's house etc.
After the fight, one guy would lose something big in life. The government banned it due to these issues.
These facts are documented, b/c King ordered the ban. Don't know the exact name of the king etc. You can do your search to confirm the facts if you have that much interest. Its hard to find information on this subject.
Now under Japanese colonial rule, it is hard to find evidence either way about their policy about not practicing Korean indigenous martial arts (Koreans say one thing and Japanese say another), but you can find evidence they try to assimilate Koreans, this further made taekkyun done in public difficult.
So now under those backgrounds there have been 2 cases of taekkyun practicioners that were known.
One is Song Duk Ki.
There was another incident where taekkyun comes out in the news in Hawaii early 1900s among Korean immigrants there.
Supposedly there was a Korean man who got involved in a fight and saved some people from thugs, they asked him what he used. He clearly stated Taekkyun. But after that the story or the person was not traceable. Nor did any taekkyun practioners come out from Hawaii.
So basically the taekkyun you are seeing lately is due to Song Duk Ki's doing.
Basically the lineage line of Taekkyun known is
Imho (Song Duk Ki's teacher, from what we know he was an aristocrat he was also friends of Song Duk Ki's older brother) -> Song Duk Ki (1893 -1987)
Song Duk Ki's story was that there were actually quiet a few of them learning/practicing taekkyun in his village, and after the N-S Korean War, when he came back to his village, none of the other taekkyun practitioners came back. Dead from war... who knows, basically his interview said he was the only one that appeared back at the village. Thats that.
He taught many after that, exactly when he started teaching i am not sure, it is not documented and you can only hear about it from the people who learned from him. And from that the result varies greatly.
There are 4 federations of taekkyun currently, led by different people.
1. The Korea Taekkyon Federation (KTF). The KTF is led by Lee Yongbok, who learned from both
Song Duk Ki and Shin Han-seung.
2. The Korea Traditional Taekgyeon Association (KTTA). The KTTA is led by Jeong Gyeong-hwa who was given the title of "living cultural asset" by the Korean Government. He learned from Shin Han-seung and
Song Duk Ki.
3. The Kyulyun Taekyun Association (KTK). The KTK is led by Do Ki-hyun who mainly learned from both
Song Duk Ki, but also from Shin Han-seung.
4. The World Widae Taekkyeon Organization (WWTO). The WWTO is based in Los Angeles and led by Go Yong-woo who learnt from
Song Duk Ki.
Now I will tell you the difference the reality of taekkyun at the moment. What you see on youtube is not how taekkyun supposed to be. (Now you guys are going to ask me where I am getting this information) You will only understand the situation if you are in Taekkyun community and have been for a long time. Its actually a mess.
Anyways 1, 2, 3 founders were taekwondo practitioners before they bumped into Song, and they only had few weeks even few months of training under Song.
#4 who is in hiding somewhere and another friend somewhere in Korea had both nearly 15 yrs approximately under Song. They knew Song before the founders of 1,2,3 appeared b/c they lived in the same village as Song. They don't teach publicly or have federation of schools.
1,2,3 are fully aware of existence of 4, yet they don't seemed to be cooperating each other.
In time when 4 appears in public is when you will see the real thing.
Now there is another story when these TKD practioners came to him and asked him if this was taekkyun and show them how it looks. Song actually invited people from Kukkiwon to take a look at taekkyun. Lot of them laughed at Song b/c it looked not what they were expecting. Well to summarized Song didn't like how they doubted him. He told one to get up and started attacking him w/ taekkyun, he ended up sparring anyone who questioned him and the art, none of them could beat him. TKD officials reported back to Kukkiwon of the situation and in the end Kukkiwon ordered these TKD masters to stay near him and learn as much as possible. This story was told by one of the 1,2,3,4 above. Remember at this time TKD looked more like ITF not the WTF.
So basically TKD doesn't come from Taekkyun. Not directly at least not from Song. There is no linkage of teacher personally teaching. I know TKD founder Choi Hong Hi claimed to have learned taekkyun, but we don't know who he learned from.
There aren't enough information on taekkyun so I am posting.