Under The Oak Tree as of January 2021, the manhwa is officially being published in English by RIDI’s Manta Comics. You can find it  on Manta’s app from your app store. Manta is a monthly subscription service, but you get unlimited access to all their titles for about $4 a month.

Under The Oak Tree chapter update every 10th, 20th, 30th on Manta. You can also read it for free at the ManhwaTop website, which quickly aggregates new chapters.

Under The Oak Tree Episode 30 read on 2021-20-06 on Manta app
Under The Oak Tree Episode 29 read on 2021-10-06 on Manta app
Under The Oak Tree Episode 28
Under The Oak Tree Episode 27
Under The Oak Tree Episode 26
Under The Oak Tree Episode 25

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See all chapters list  Oak Tree manhwa