Can I synchronize two master DB clusters using logical replication?

Hi ^^
I have two DB clusters. One is in South Korea, and the other is in US.
Each cluster generates its own DML commands. (INSERT, UPDATE, DELETE)
And I want to synchronize this two DB clusters using logical replication.
I tried this, but it failed.
Specifically, I succeeded to replicate one DB cluster to the other.
But when I set logical replication in both cluster, only the former which I
set first works.
Can I use logical replication to synchronize two master DB clusters?
The following is what I did.

[ In Korea cluster ]
------------------------------------------------------------------------------------
- postgresql.conf
wal_level = logical

- pg_hba.conf
# IPv4 local connections:
host <KR DB name> postgres <US server IP>/32 md5

CREATE PUBLICATION mypubKR FOR ALL TABLES;

CREATE SUBSCRIPTION mysubKR CONNECTION 'host=<US server IP> port=5432
user=postgres dbname=<US DB name> password=<password>' PUBLICATION mypubUS;

[ In US cluster ]
-----------------------------------------------------------------------------------------

- postgresql.conf
wal_level = logical

- pg_hba.conf# IPv4 local connections:
host <US DB name> postgres <KR server IP>/32 md5

CREATE PUBLICATION mypubUS FOR ALL TABLES;

CREATE SUBSCRIPTION mysubUS CONNECTION 'host=<KR server IP> port=5432
user=postgres dbname=<KR DB name> password=<password>' PUBLICATION mypubKR;
---------------------------------------------------------------------------------------------------------------------

If I make 'mysubKR' first and 'mysubUS' later, replication from US to Korea
works well. But Korea to US doesn't work.
If I make 'mysubUS' first and 'mysubKR' later, replication from Korea to US
works well. But US to Korea doesn't work.
I hope both direction work well.
How can I solve this problem?