Couldn't find the clips with him speaking more English, there are a few clips here. (He's the one in the black beanie.)
Parts are at
I don't know how well his English is now, but he has improved a lot since the video of him trying to converse with Kibum. He does have a nice singing voice when it comes to singing in English and the interview video I found, his conversational English has improved a lot.
He is the sexiest husky baritone. The lower notes in his register are smokey and sensual, and his rare falsettos are sweet and silky. His control is amazing; not only was he blessed with such a unique voice, but with the ability to use it perfectly. Yesung’s voice was made for soul music. He was made to sing smooth, yet powerful, R&B ballads. He gives Super Junior songs their soul and depth. Love his voice, randomness/silly personality, and overall attractiveness.
I don't understand how he isn't popular in the group (maybe things have changed), maybe he was overlooked in the beginning, but oddly enough he was the first one I noticed besides Kibum, Kangin, and Siwon. He's a cutie and has a wonderful singing voice.
I especially love this version of The More I Love You. He puts so much emotion into the song. The note at 3:20 <3 Really think he could do Rock songs too.
Anyway, I felt like I could relate to him, even though I don't care what people think of me and my weight and not being thin enough.
There are a few things I do not agree with that he's said in interviews pertaining to other idols, and he sometimes does come off a bit blunt, cold/angry, cocky, and rude at times even when 'joking'. I don't know at first glance he just looks like a angry or cold person to me, but may not be the case entirely.
He apparently is known to be caring and sweet at times,known mostly for his absolute zero tolerance of disrespect, is not a touchy, emotional person,not at all one to express his feelings openly, and a bit of person who likes to be mischevious.