Ailee blew away everyone, including legendary ballad singer Lee Seung Chul, with her cover of "Heeya" on 'Immortal Song 2'.
Her charismatic rendition of the well-known song definitely impressed the crowd, and Lee Seung Chul praised her performance by saying, "My mind is blown... I feel like my territory has been invaded. There would always be an awkwardness when another singer besides me sang this song, but I got the same feeling from Ailee's singing as I do with mine."
Ailee did manage to beat Huh Gak that round, but Ulala Session took the final win this episode.
Source: allkpop.com, youtube
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First time hearing this song and I FELL IN LOVE. She sings it so wonderfully.
edit/ Studio version linked in the comments by

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Date: 2013-05-31 02:15 pm (UTC)no subject
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Date: 2013-06-01 10:16 am (UTC)The 'saved Korean music' sentence makes me lol. I guess being a legend did makes him lose his ground and become more arrogant. :(
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Date: 2013-05-31 02:43 pm (UTC)no subject
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Date: 2013-05-31 03:58 pm (UTC)i need ailee to get incredibly huge worldwide tbh
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Date: 2013-05-31 03:59 pm (UTC)no subject
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Date: 2013-05-31 04:32 pm (UTC)no subject
Date: 2013-05-31 04:23 pm (UTC)does ailee pull out an earpiece at 4:08?
channeling beyonce like a champ LMAO
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Date: 2013-06-01 10:21 am (UTC)no subject
Date: 2013-06-03 08:53 am (UTC)it is just hilarious that beyonce did it so dramatically because she was lip syncing the entire national anthem
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Date: 2013-05-31 07:17 pm (UTC)no subject
Date: 2013-06-01 05:47 am (UTC)no subject
Date: 2013-05-31 03:12 pm (UTC)GO SLAYLEE!
i love her so much
HOLY FUCKING SHIT THAT INTRODUCTION TO THE SONG OFFICIALLY ENDED MY LIFE
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Date: 2013-05-31 07:18 pm (UTC)no subject
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Date: 2013-05-31 05:06 pm (UTC)no subject
Date: 2013-05-31 05:24 pm (UTC)This will forever be my favorite though:
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Date: 2013-05-31 07:18 pm (UTC)no subject
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Date: 2013-05-31 10:47 pm (UTC)no subject
Date: 2013-06-01 06:37 am (UTC)I'm a super huge fan of this song although I reckon that her performance here is very good, it's not as emotional as the original version due to the arrangement.
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Date: 2013-05-31 06:55 pm (UTC)https://soundcloud.com/teyong/ailee-1
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Date: 2013-05-31 10:45 pm (UTC)no subject
Date: 2013-06-01 03:01 am (UTC)I feel like they do the whole screaming/holding long notes thing way too often, but so do a lot of artists on that show.
For them though, Idk, it just doesn't do anything for me.
But this performance was great, I felt like she didn't over do it like she usually does.
Side note: Was the blonde-ish guy they showed in the waiting room FTI's Hongki?
He's looking a bit tore up.
Also side note: I am dreading/looking forward to this episode of IS2 because of Ulala's return.
I think seeing them perform without Yuntek is gonna take me awhile to get used to.
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Date: 2013-06-01 09:02 am (UTC)no subject
Date: 2013-06-01 09:28 am (UTC)Also, could you give me examples in IS2 in which you think Ailee overdoes the long notes? Because I feel that way about Hyorin often (they always seem out of place) but I've always thought Ailee managed to balance everything perfectly, and executed them incredibly. Plus, long/high notes tend to impress the crowd, which tend to bring in more votes lol.
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Date: 2013-06-01 06:35 am (UTC)no subject
Date: 2013-06-01 08:16 pm (UTC)The girl did goooooooooooooooooooooood
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Date: 2013-06-03 06:07 pm (UTC)slightly OT but anyone familiar with Guckkasten's version of Heeya? love it: http://www.imbc.com/broad/tv/ent/sundaynight/common_page/clip/index.html?list_id=5512135